Are Humans Slowly Losing Their Eyesight? | The Nearsightedness Epidemic
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- čas přidán 27. 07. 2024
- Is it true that humans are slowly losing our eyesight? Is your vision blurry? While it's not the kind of epidemic you're used to hearing about, nearsightedness is becoming a major health issue in many places. Join Michael Aranda for a new episode of SciShow and learn about how scientists are finding out the reasons behind the increase in myopia, and how sunlight might be a key factor!
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Sources:
www.nature.com/nature/ebooks/s... (pp 18-20)
www.npr.org/sections/health-sh...
www.npr.org/sections/goatsands...
archopht.jamanetwork.com/artic...
archopht.jamanetwork.com/artic...
www.aaojournal.org/article/S01...
jama.jamanetwork.com/article.a...
digitalcollections.anu.edu.au...
iovs.arvojournals.org/article....
journals.plos.org/plosone/arti...
www.popsci.com/why-are-so-many...
www.washingtonpost.com/news/s...
"Got it!"
Stare at the sun to prevent nearsightedness.
Permanently.
Now you have no sightedness!!! Good job😊
@@kittycat-sc7je Anti-sight
oof
-_-
"This creates an image that's blurrier when looking at anything farther than your outstretched arm"
Bold of you to assume I can see even that well
This is how I describe my sight
If i don't have my glasses, i can't read my phone further than 6 inches or less.
High myopia here, i was born with it. Not even my shoulder looks sharp xD
@@tonk82 bruh XD
IKR LOL. I only know what things say/are without my glasses because of colors and mild shapes.
I like how our display technology advances to the point of HD resolutions and beyond just in time for increasing parts of the population to start seeing naturally at the resolution of a VHS tape
Or a literal 4x4 pixel grid (like me)
This comment is killing me haha
At least now we can afford tvs big enough to be clear from across the room. Anyone else remember goldeneye splitscreen on a 13 in tv?
That's why i never bothered with anything more than fullhd even on big tv, i just can't see that resolution
Lmao... but between my myopia and astigmatism, the VHS tape is crystal clear..
I’m in Singapore and I laughed when it was mentioned that we only spend about 3 hours a week outside.
Because it’s so true.
Now it’s even worse because a lot of school is online now :/
Thats such a horrible life.
@Thomas Kirkpatrick you're pretty ignorant. Children in Singapore have the longest school hours of any country. And there isn't much grass is Singapore either. It's basically one big city.
@@EdgyDabs47 how long is Singapore school hours has to be above 7 hours as that my country for schools specifically and im definitely sure south korea's the worse for school time or maybe that's just time spent studying for school.
@Algye school hours in sg id roughly the same as us for 15 and below ish
So nerds have a higher chance of being nearsighted because they are inside more?...so the whole stereotype that smart people always wear glasses does actually have some ground...ok that was unexpected.
+sondrex well if you are an inside nerd (inside researching stuff) then yes. an outside nerd (outside studying stuff) then no
hmm interesting, I have never heard of these "outside nerds" you are refering too...
hmm i guess i just made the term up XD
hmm...yeah that might be it...either that or maybe they are extremely rare?
+sondrex Stereotypes always have some bases in reality.
The other difference between inside and outside is that when you are outside you can look much further - like out to the horizon. You simply cannot focus on such a distance indoors. So it may not be the presence of "near work" but the absence of "far gazing".
This actually makes sense like if you practice looking at super far distances you can do that alot but if you are always looking at thing close to you your body thinks you don't need to see things that are far away so It removes the ability to do that.
unless you have windows in your house, and you don't live in a city and can actually see far out of your window.
@@noahwattel4226 unless your house is in the middle of 10 meter thick forest and because of that can't see anything
@@perttutunkkari3275 XD well just look between the trees.
I just posted the same point from my experience as a ship's officer. So even outside in an Asian city whats to see but the next building which is not far away.
Well I spent plenty of time outside as a child and my eyes are terrible!
"The dopamine cycle is needed for healthy eye development"
Oh, of course! The childhood depression! How could I be so naive!
I was about to comment that
Samesies :,(
Right? I got glasses when I was 7 and I spent most my time outside
LMAO
Same as well. Played outside lots along with playing soccer as a child. Maybe our darker winters in Canada are to blame.
I suddenly became nearsighted over the course of a couple months when I was a teenager and now thinking back on it, the only thing that changed in my life back then was that I got depression and stopped any hobbies that involved outdoor activities
i already become nearsighted when i was 8 years old, funny thing is i'm quite a stupid kid back then so i spend most of my time not studying but instead play outdoor, the nearsighted still worsen til this day which is now more explainable because i'm now for some reason a nerd so yeah i spend 1 hours at best going outside and someday just not going outside at all, didn't help that my room doesn't have a single windows for sunlight either.
Oh my God same
💀🤚🏻
So sad. Being outdoors is supposed to ease depression.
Yeah when i began to wear Glasses i became very depressed.
shit
i'm nearsighted
*gets up*
*looks out window to see 3+ feet of snow*
....
*sits down* fuck that.
Wish I had snow... :(
+Hallowed Thrall (#AMDRedTeam) Not here you wouldn't.
+Hallowed Thrall (#AMDRedTeam) Don't worry, I'm here.
+Hallowed Thrall (#AMDRedTeam) it was like 80 degrees in Florida on Christmas..... And 60 degree here in Maryland
+Levi Le Heichou Ackerman If I had that much snow I would practically live outside
"Are iPads ruining our eyeballs?"
*Is watching video on a iPad*
Haha me too
Me too
IncandescentHeart is your cellphone giving you cancer? *reads on cellphone*
I mean, the answer was 'no'
IncandescentHeart it's recommended 6"-8" away from the screen of devices
Wow...I guess I didn't realize how lucky I am.
1. Both of my parents were/are nearsighted (one got lasik) and have needed glasses from a young age.
2. I am the first born child in my family.
3. I don't go outside too much.
4. I study a lot (reading lots of books).
And despite this I still have 20/20 vision.
Lucky you
I'm later and my nearsightedness is the worst among 3, damn it blurry vision is such a pain in the @ss, i'm worthless without these pair of thick glasses, my vision is basically softcore-blind at this point lol
How old are you? Mine didn’t start til I was like 25. I had 20/20 up until then.
@@kevinhedman2314 17, but both of my parents were nearsighted before that age. I guess you're right, because bad vision often develops in adulthood too.
I think the primary factor is genetics. It's like how our height and metabolism is already prefixed by this lottery, but we could make it better/worse by our lifestyle.
There is a consolation prize to nearsightedness: At the age when normal-sighted people need reading glasses (or longer arms), I can just take off my glasses or look over them. "Old-sightedness" is canceling out the nearsightedness when doing "near-work".
Thank you for a video that treated this topic with the type of detail it deserves. Too many people, including some very popular science channels, jumped on the cell phone bandwagon, but that has never been a serious contender. You were able to summarize the studies, and give the front runner with some helpful and practical advice, but still give caveats appropriate to the state of knowledge. Kudos!
what is this so called sun ?
I've heard it's like a ginormous burning gas ball or something.
+Its Us nope, still have no idea
I think it's a big nuclear reaction of mostly hydrogen and helium, and that we fly around it
+Its Us is plasma
It's a thing that we, on the earth, revolve once in approximately 365 days. During its life time, it goes through a process called nuclear fusion, burning hydrogen into helium, helium into lithium, lithium into beryllium, beryllium into boron and a couple of more materials.. After it fuses for some time, it turns into a red giant, which will kill the planets Mercury, Venus, and earth. After a millions of years, the outer skin of the star will collapse onto itself, and become a white dwarf. That white dwarf will burn for hundreds more, until it becomes a black dwarf. I'm only 13, so please correct me if I'm wrong, but that's all I can remember.
So one of the things I deal with is called keratoconus. It's basically where the keratin in your eye gets too weak to be able to hold its shape properly. This creates peaks and valleys (it can turn your eye into a cone, hence the name). It's basically super astigmatism. A newer procedure they do is basically dropping riboflavin drops in your eye and hitting it with a UV light. The riboflavin & keratin crosslink, creating much stronger keratin. It doesn't reverse the damage done, but it does help prevent the disease from progressing.
I recognize that this video is old, and I haven't done a lot of looking into the history of the procedure, but I wonder if the studies done about myopia are related to the crosslinking procedure.
As someone with keratoconus who recently underwent crosslinking in both eyes, I appreciate what you do. 👍
What you are describing is not keratin, it is the cross linking between collagen fibers.
We will never perform lasik on a keratoconus pt, glasses will only help mild cases and usually the best achievable vision is attained with hard contact lenses that help to fix the optics of the cone shaped cornea.
Whenever you hear the term Epidemic
Me: Laughs in 2020
(I now know the difference between epidemic, and pandemic)
r/youngpeopleyoutube
He said epidemic
@@ThrustersX zoomers gonna wear the corona as a badge
*pandemic* is what we're going though. it sucks!
Came here to make the same comment. You know nothing, 2016 Sci Show!
my childhood was spent outside. from the moment i could walk i was outside. outdoors was MY LIFE, MY CHILDHOOD!
Im 15 and I am legally blind without contacts. WHY CRUEL WORLD WHY?!
***** Reduced central visual acuity of 20/200 or less in your better eye with use of the best eyeglass lens to correct your eyesight. Legal blindness is a level of vision loss that has been legally defined to determine eligibility for benefits. The clinical diagnosis refers to a central visual acuity of 20/200 or less in the better eye with the best possible correction, and/or a visual field of 20 degrees or less.....so, yes, i am just very very nearsighted lol
retinal detachments when I was 26, spent a lot of time outside as a kid (during the summer). I feel ya.
Learn to use your inner sonar like Daredevil.. and bats! ;D
No seriously, there was a blind kid who clicked his tongue to sense things around him. Unfortunately he died in his teens, but he was extraordinary!
David Allen Yeah... I also heard somewhere that he was also sometimes able to play video games. Don't ask me how that works but damn.
Lindsey Well, I have an astigmatism, which means I was born with wonky eyes. So it probably is just the structure of your eye, hun.
Do children in northern European countries, where there is limited sunlight during the winter, suffer more from near-sightedness?
Pretty difficult to find out since it's all been drowned out by everyone being inside all the time now. You'd have to find some good historical records.
@@TheAkashicTraveller Most Norwegians keep their newborns and babies outside during their naps to make sure they get lots of sunlight. relocation.no/babies-sleeping-outdoors/ They have special blankets to keep the baby warm and baby monitors with thermometers inside with the baby to track the temperature the baby is experiencing.
I grew up in England and northern Germany and my parents made sure I got lots of time outside each winter to protect me from rickets as a baby. It was called a sunbath, but my Mum said it was maybe 20 minutes to half an hour per day.
Traditionally, northern Europeans make sure babies get lot's of time outside for vitamin D, help against jaundice and a general belief that the sun is good for you. The problem being is we tend to go a bit over the top. Part of the problem with skin cancer in Europe is that being outside is seen as therapeutic. But you can't have too much of a good thing.
@@runningfromabear8354 Yay Magnus Carlsen
@@DevanshGuptaChess Are you calling me MC? I'm a girl.
@@runningfromabear8354 I mean Magnus is from Norway and I am a big fan of his. Seemingly he slept in the sun when a baby and is now Magnus. Love from India and thanks for the reply
We evolved like most creatures under the sun for extended periods while performing our basic tasks...Then we artificially intervened without knowing it...Now we have repercussions. Makes sense in hindsight.
dead pun
Interesting! I first noticed that I was becoming nearsighted near the end of my undergrad. I am now nearly done my PhD and absolutely require them now. I needed them 10-20 years earlier than either of my parents. This all fits! How fascinating!
outside? whats the IP for that server?
000.get.your.ass.out.sid:e
+lisa lavergne "e" is not a valid port
+Chancellor Chesnaught 438.688.743.396
havingMC dang it
+Chancellor Chesnaught i think its a new game on the iphone, not a server
*SO GLASSES REALLY DO HAVE A CORRELATION WITH BEING SMARTER*
Yessssss!
+Falcondances Huzzah!!!!!
+Falcondances Not really. Dumb kids have to study a lot to perform. Smart kids like I was never studied and only got A's and B's.
+Abhi Nath QUICK! Copy the homework from the kid with glasses before the teacher gets back!
+Falcondances Haha nice one four eyes.
but you know what smart people say: correlation does not imply causation.
"When you hear about epidemics, it usually has to do with some frightening virus like HIV or Ebola."
Tell me more about such viruses, man from the past.
Yes, yes.
Wasn't there a wave of nearsightedness in children who were inside as a result of pandemic? I guess I'm doomed to live nearsighted, but I hope the world is gonna progress on this, so that later people don't. Being indoors all day sucks and maybe it'll be our decaying eyesight that will force us out haha. Or maybe we'll just put the lights on in classrooms during the day and give kids special glasses or some contraption like that to prevent myopia. lol
If full spectrum lights weren’t so freaking expensive I would say that could be an option.
Nah humans don't change, we change reality to suit us which means we will find a way to fix this and move on. Definitely not changing our habits over this.
I blam it shit on the schools! In middle school and high school your stuck indoors for about 7 hours for 180 days every year. By the time they go home they're all mostly tiered and just wanna chill, ain't no body got time for going outside. Some fools even forgot how to play outside, if your lucky enough to have a free day with the class I'm positive more than half the class is just gonna gather in groups socialising or just use there phones under the shade :/
+Rollerzs learder "ain't no body got time for going outside"
Do kids these days go to school for more hours than 30 years ago?
I doubt it. Pretty sure it's the same, if not less.
+Victor G There have been improvements in education that require more focus on learning and less time for other activities. Consider that cultural priorities have shifted as well, including an increased focus on education, the rise of the Internet, etc. I like to believe that, though necessary, school systems need to be updated to not only educate to the the benefit of each individual, but also provide care for the students.
+Rollerzs learder Where do you go to school? In the US, or California at least, middle schools require an hour of PE every day, which happens outdoors unless weather prevents that. High schools require a year of PE to graduate, so that could be better, but still isn't as bad as what you say.
Plus, sitting in the shade is fine. You're still outside getting more sunlight than sitting inside watching TV/playing video games.
+Kitsune Gaming Here in Illinois we only had 45 minutes of PE a week during grade school, most of which took place indoors. Highschool was 45 minutes a day, also taking place mostly indoors.
+Kitsune Gaming yeah I'm from CA originally but I moved to the south in Arkansas you only need one semester of PE. And it's indoors in a smelly old gym. Unfortunately the rest of the county is not blessed with sunny skies year round. Here in AR we have fall (the raining season) , winter (which brings Ice and snow), spring (aka TORNADO and allergy season), and summer means schools out.
*Japanese child:* "Dang you, homework, you are *ruining* my eyesight!
*American parent:* "Dang you, Nintendo! you are *ruining* my child's eyesight!"
Reality: Dang you, stupid society and lazy self, get out more!
Clearly it's all nintendo's fault for making the original gameboy and gameboy colour unplayable undersunlight.
i would love to like this 1k times.
I feel like I'm being summoned!
@@GiorgosKoukoubagia being studious isn't lazy
Did they adjust for the difference in focus caused by being outside and having no walls? I'd think that would be more compelling a relationship than light.
I was thinking of the same thing. When you are outside you focus on alot of things at varying distances. When you are inside the furthest thing you can see are walls.
This actually makes a lot of sense. Out of my school soccer team maybe 4 or 5 kids wear glasses out of about 35, while out of my friend group, mostly the nerdier type who have parents who expect a lot of studying snd are less likely to do actividad outside, maybe 5 people DONT need glasses out of about 20. Probably about ten don’t wear glasses/contacts on the regular, but several of those people have glasses they sometimes wear and are technically prescribed to wear, or simply refuse to get tested despite not being able to see what’s actually written on the board. Point is, there’s a very clear contrast between two groups of kids who grew up in, generally, similarish circumstances. The kids who likely spent far more time in childhood outside are less likely to have eye issues, while those who spent more time inside and less outside are far more likely to need glasses.
One factor you didn’t address is that when outside you’re essentially doing “far work” and flexing your eye to focus on things in the distance. This medium & far focus strikes me as the Yin to the “near work” Yang that balances their muscle development in and around the eye itself, resulting in healthier balanced vision.
Ahhh yin yang aka balance go sunbath but not for 6 hours and get a sunburn
Michael MagniMedia There is sunscreen. So you don't get sunburn. Sunscreen and clothing
Wouldn't far sight relax the eye muscles, rather than work them?
That's a nice hypothesis, if they haven't "addressed it" it must be because there's no evidence for it.
Ah, but how much harder would it be to convince people to not only go outside but also look around?
Look away from people in their group, away from the ball they’re chasing, away from their phones, and actually look around them? Daily and for multiple hours? Especially in highly urbanized areas where sight lines might often be blocked by buildings. It’d be very hard to control an experiment that addressed this on a large enough scale to show statistically reliable improvement or failure.
Played outside almost everyday I could as a kid. Still blind as a bat without eyewear.............
Yeah, me too. I think it is very important the time you spend outside when you are a baby, but he didn't even mention it. Playing sports later could be also a big part too, I didn't play them, but maybe my nearsight had something to do with me don't enjoying playing them.
I started to notice my eyesight drop about the time i got into smartphones and computer games, but i think its genetics first of all
Genetics then
@@yahikokurotama4351 for many of us I agree that genetics was the origin, but behaviors very much exacerbated the problem and not engaging in eye strengthening activities that could have largely corrected the issue made it effectively permanent.
I was astounded when I noticed a drastic improvement in my vision during a short, intensely sunlit portion of a multi-month hike (the PCT). I'm over 50 and had glasses/contacts for 40+ years.
Imo, just another case of human behavior choosing the easy ("it's not my fault / I can't help it) path and not the better path. I'm not innocent here, but I hope some younger people choose the harder better way.
@@sempergumby3929 Young people are not ALLOWED outside by their parents most of the time. Fix THAT problem. Teach parents how to actually parent rather than try and mold people like pots.
I found out I was nearsighted when I was 7 or 8. I spent most of my childhood outside (until I discovered books were much more enjoyable to read inside). My mom was worried I wouldn't want to wear my glasses. Never was a problem, I couldnt believe how much I was missing without my glasses!
I discovered I was nearsighted at 7 or 8 too. I was outside a normal amount I think. It was a long time ago. I went through glasses, hard contacts, soft contacts, back to glasses, thought about LASIK and the like but it was new and never got it, then got early severe cataracts and had cataract surgery. Now I can see far away great but need glasses for close up. Exactly the opposite as the whole rest of my life.
Thankyou for giving an informative and credible explanation. Please keep up your awesome work! Love this channel
Hope you have a nice day to all the readers
It's not sunlight exposure itself, it's long distance focus to the horizon. The sunlight helps by contracting the pupil for a sharper focus.
lohphat I had this same exact thought. I’m surprised that wasn’t considered in the study.
And how does that help the eye to stay in focus indoors (i.e. prevent nearsightedness)?
@@DrorF maybe something similar to muscle memory
@@hamsacc maybe. And maybe not. There is no scientific evidence for these claims.
See:
en.wikipedia.org/wiki/Bates_method
@@DrorF that's sad. I really hope a cure could be developed in the future somehow.
i was told going outside was very important for stopping nearsightedness, but they said nothing about sunlight.
its more about the fact that your looking around a f'load more than if you where indoors. and focusing on near and far objects in your environment rapidly all the time.
the eye is a muscle after all so it makes a lot more sense than sunlight being the reason
Joaquín Nuñez sorry, i'm just a random person on the internet. i thought it was a very good video but the idea of sunlight stopping nearsightedness sounds like a load of bull.
my opinion as a person that isn't a Optometris. and im sure your not one either
I heard my name mortals.
+DayInDaLife There is indeed research on long-term near work causing myopia for some people, at least according to my ophthalmologist.
+The Sun If it isn't my mortal enemy.
+Jake he did give an explanation fyi. Specifically involving the dopamine cycle but he also stated than it may be sports in general. I personally believe that it simply is to do with general mental health ie depression and dopamine sensitivity in the eye. Thus meaning that sun exercise and fresh air all play a part whereas indoor activities such as video games (which are specifically designed to promote dopamine release) potentially desensitize your body to dopamine. But this is speculation as an dopamine sensitivity in the eye and dopamine sensitivity in the brain arent necessarily linked.
That feeling when you're nearsighted and photosensitive but now you're being told to spend more time in the sun...
tf is photosentive
@@cooper_76 being photosensitive means you are more sensitive to light and in turn bright light
@@yoface938 this guy right here is a genius everyone
@@windowwatcher9161 bruh.... grow up, imagine being sensitive to light🤣
@@cooper_76 based
Interesting content, but what really stands out for me is the fact that I can more easily understand what's being said. The pace at which this lesson is given is slower than the other two individuals whom I've seen/listened to here.
My brain can keep up.
I recommend putting the speed down for the others! It really helps slow things down and make things easier to precess
How about reading books outside?
Reading doesn't damage your eyes, that's near work. As long as you're exposed to sunlight it doesn't matter what you do, if the studies are correct that is.
Good way to get cataracts.
+Ainsely Harriot how so?
+frenchtallama I believe cataracts are related to uv light exposure.
+Gena Trius Have you ever read a book on a sunny day? its impossible!
Seriously, pages are really reflective.
thanks, now i have a reason to go outside -_-
+Xantog you thank him for that?
Zeppelans YUS
***** omg thanks, now i have to stay inside.
+SuperLifestream Neigbohours upstairs might complain.
+SuperLifestream Doesn't seem to work.
8:22 Wouldnt that be crazy? A terrifying virus that creates a cultural identity of staying indoors? Hah, hah.
Yeah.
Yeah.
@@tynj4173 not in Australia lol.
THE SUN IS A DEADLY LAZER! *not anymore there's a blanket* *NO* why can't we go on land again? *THE AIR HAS A DEADLY VIRUS*
A bright eye-opener,! thank you for this video!
I can say this is true. My vision was perfect until I hit middle school, where I quickly was just unable to see the board at the front of the class. That stuck till end of high school. Once I started college, I was outside more & my vision improved, and is still improving now; I don't need my glasses to do 99% of things. Now that's quite interesting. Really hope it is the sunlight.
I had a similar experience too. Because from middle through high school I had a heavier prescription. But then when I spent 3 years doing outdoor work and my prescription actually improved. I can't even look through my old glasses because theyare do strong.
That is so interesting! I also had to have glasses in the last year of high school, because I couldn’t read the writing on the blackboard. But I wish my eyesight had stayed as good as it was before. Your stories give me hope!
I am the same too. I still did go out and play when i was in early half of my high school and half mostly indoors. Even then my eyesight was bad and just gone worse. I kinda hope mine improves because I'm fed up of using glasses but it's unlikely. My work includes spending indoors all day and during summer I could barely see outside because it's so bright. It's not dark or anything, just not bright enough.
Middle school was the time I needed glasses too. I spent lots of time playing outside until middle school when I started doing a lot of computer programming. My nearsightedness never got better. I'm 50 and my eyesight is as bad as ever.
Both of my parents have terrible vision and I spent almost all of my time reading up close as a little kid. I’m also the firstborn. Also, I almost never go outside
Needless to say, I can do almost nothing without my glasses and I’ve had them since I was 9.
I guess growing up in Iceland doomed my eyes. We have almost no sunlight in winter and then 24 hour sun in the summer months. That means my dopamine cycle isn't properly fucked
+SaraMargret Sama hér. Þetta er samt ekki alveg logical, af því minur minn er með algjörlega fucked augu, og hann var meira útimaður en ég. Ég er með jafn slæma sjón og faðir minn og bróðir minn. En vinur minn hafði ekkert þannig í sinni fjölskyldu... Kannski eitthvað mutation, en samt... Held að sólarljós sé ekki það eina sem hefur áhrif á þetta. Held að stór partur af því séu einfaldlega bara gallar í DNA, sem hafa komið upp meira á 20. og 21stu öld, og mögulega hefur minnkuð útivist fólks í tæknivæddum samfélögum eitthvað með það að gera.
+Pajama Llama (Hatson) Ég er allavega með -4,75 sem er alveg hryllileg sjón. Ég bókstaflega sé ekki rassgat án gleraugna.
SaraMargret Sama hér sko. Síðast þegar ég checkaði var ég -4 og -4.5.
Mögulega kringum það sama og þú núna.
Dopamine? Do you mean melatonin?
+Michael Braun lol yes. Hahaha, don't know why I wrote dopamine :P
People used to balance viewing time between long distance viewing and close-up viewing. Many people today are spending most of their time doing close viewing. Therefore, nature has decided that close viewing people don’t need their good distance viewing anymore. I have spent much time outside, am a hiker and backpacker who looks into the distance daily. My optometrist pointed out to me 10 years ago that my distance vision was far better than average because I am outside so much looking into the distance. I tell my staff, who work at computers all day, to take a walk outside at breaks to use their distance vision, and also to get up and look out the window into the distance once every 2 hours.
watch the video it literally disproves "distance viewing"
Did you even watch the video...
Always informative, thanks.
It baffles me that we still can't figure out a real reason why this nearsightedness is so prevalent and that people simply don't seem to care enough about it to find an actual solution, despite almost half the entire population of the world needing glasses to correct myopia.
Wearing glasses and our heavy reliance on them is simply beyond an inconvenience. Glasses are cumbersome, or impossible with some forms of physical activities/sports and can even deter people from healthy exercise. The other alternative is using contacts which you can't even wear if you're a person who has drier eyes and they also need to be constantly purchased, washed/replaced and taken out daily or before sleeping/napping.
Lenses are also designed to be viewed only from the center and correcting even moderate amounts of myopia with any kind of lenses causes distortion (slight fish-eye effect) around the edges and corners that scales worse with the degree of myopia you have. While you can adapt to this distortion and regain your depth perception, the way you see everything with lenses will *always* be distorted.
Then there's laser eye surgery, which you can't get under the age of 18, is still very expensive, and not everyone is physically eligible for. You might not even get great results after the surgery and there may be complications.
This is an epidemic indeed, and more people should care.
+KitMellow What I don't understand is what actually makes your eye sight worse.
I've realised I'm near sighted for a while, but I didn't get an eye test for whatever reason until a week ago. The doctor said that myopia is mainly due to genetics, but doing near sighted activities also play a role in worsening your eyesight. However he also said that I have become increasingly near sighted due to the eye strain I have by not wearing glasses. On one hand he's saying doing near work makes you near sighted and on the other hand he's saying looking at things far away also makes you near sighted.
That's what they all say. I've heard the exact same things from many different optometrists.
Getting glasses earlier (in theory) slows down the myopia process, but it still worsens regardless if you wear these glasses or contacts.
Yes genetics can play a role, but it seems to be a much smaller influence than people think, because I know people with parents that never wore glasses but are still myopic to some degree and some even some deeply myopic themselves.
And then there's people who have plenty of outdoors/sunlight but can still have nearsight/farsight problems.
It's 2016 but nobody seems to know what the actual determining factors are... We know the *theorized* risk factors, but it doesn't really help right now when the need for glasses is scaling faster than the human population is growing.
I am some degree of near-sightedness. I have no idea anymore how much so because, about four years ago, I sat on my glasses and broke them. I was stupid-broke. And it was about that time, that I started to work outside full-time. At this point, I don't really need them anymore. I just always figured my laziness and brokeness made me adapt to the eyesight I had. Who knows- it could've been the sunlight. I guess I should eventually go in to get my eyesight checked but you know - the only time I really noticed that I was near-sighted was while in college, trying to read the whiteboard under harsh fluorescent lights across the lecture room. When I'm outside, I can spot a hawk carrying a mouse from across a field. So - you know. Anecdotal but my experience. I guess it just depends.
This is absolutely fascinating!! Thank you for shedding light on it.....😏🤓
FilbieTron would you say that its.... eye opening?
. . .
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Yeah this makes sense because most of my childhood i saw perfect, fastforward to now, im 20 and found out I need glasses, the past few years I had trouble seeing from a distance, I have been indoors mostly these past few years compared to my childhood and teens where I went outside more.
boo
We can't be friends.
I started getting symptoms of depression at 8 years old, also the same time as when I started developing myopia and also when I started wearing glasses. Not only that, (I'm Asian) my grandmother was always strict about my education and I was pressured to be a straight A's student. In fact, she even made me solve advanced math problems during summer break from morning to night. At 17, I was officially diagnosed with depression and by that time, I learned that sunlight and chocolates helps stimulate dopamine. I'm 26 now and I have horrible vision, but I try to get as much sunlight as I can now.
It was so intriguing to me how much more definition i could see sometimes on a sunny day.
I have to say, I appreciate how gentle, smooth and calming your voice is. Thumbs up to you!
So if I look at the sun my nearsightedness will be cured? PRAISE THE SUN!
You'll just go blind if you stare at the sun
+lisa lavergne and that means no more near sightedness
+lisa lavergne let investigate that hypothesis.
+Dazidan ALL HAIL THE NIGHTMARE.
+jeco0357 If you look directly at the sun, your sightedness will be cured... trolol
This was so interesting! Thank you!
Awesome video. It's very interesting to hear some facts about nearsightedness.
Can you do an episode on the stupidity epidemic?
You mean the smartness epidemic, where the average IQ is consistently increasing at 3 points per decade in pretty much every developed country and age group? Look up the Flynn effect. You won't find a "stupidity epidemic."
+HarmonicPsyche The BLM and third wave feminist movements beg to differ.
Kirk Turner That's a fallacy of faulty generalization (en.wikipedia.org/wiki/Faulty_generalization). You are falsely implying that the traits of a nonrandom, nonrepresentative group can be generalized to the entire population.
+HarmonicPsyche Yet the blm movement represents a small minority of the black population. Many blacks are of the opinion that blm is doing far more to hurt the community than to help it.
Kirk Turner
Did I attempt to defend either of the movements that you mentioned? My point was that neither the BLM movement nor the third-wave feminist movement is a representative sample of the population. To say that characteristics of either group can be used to draw inferences about the general population is a fallacy, as I previously mentioned.
"I said no such thing." I pointed out a statistical trend, and you offered nonrepresentative groups as counterexamples. Because trends frequently have outliers, one cannot use isolated examples to show a trend.
However, if your argument does not include "stupidity is increasing" or "intelligence is not increasing," then the misunderstanding is my fault and I apologize.
"You have improperly inferred such a fallacy to so you can go all SJW." You do not know my motive(s), and even if you did, they are irrelevant to the validity of my argument(s). Claiming that motives are relevant - which I am admittedly unsure if you did, but I mention this just in case you did - is a fallacy because it attacks the source of an idea instead of the idea itself (study.com/academy/lesson/attacking-the-motive-fallacy-explanation-examples.html).
To assess whether or not stupidity is increasing, one must repeatedly take a random sample of the population and find the average IQ. Then find the trend, as Flynn did.
my father is nearsighted (but just recently after he turned 45) and my mother is farsighted. i'm the 3rd child and the only one who is nearsighted. By older brother played soccer outside, while i spent my hours in a swimming pool or in front of the tv (i never joined the outdoor activities). BUT i do remember playing a lot outside when i was a kid, and we were outside for at least an hour in school or kindergarten. so it could make sense that sunlight works, as my brother got double the amount of time outdoors.. it has to be combined with your genes, as my sister was also a swimmer and got no problems with her sight.
Did you swim indoors or outdoors?
oh heck, i'm the same when it comes to the first sentance
Yes but you close your eyes while swimming most of the time.
As a firstborn, who has been mega depressed a few years before this video was posted and a neurodivergent who has lack of dopamine receptors, I can say I spend almost all of my teen hood in bed behind closed curtains. Got siblings who are 6 to 11 years apart from me, and they all go out when I didn't and the kids aren't blinded by nearsight like me
That’s funny. After hearing that spending time outside prevents myopia, my first hypothesis would be that actually having to train your eyes to focus on things further away than the four walls at home is good. But these guys jumped right away to checking if sunlight does it? 😂😁👍🏻
This makes me wonder if it's the stimulation for the nutrient production that affects eye health over time~ now I'm gonna look up if vitamin D affects acuity, lol
Aaand it does. Apparently, it helps prevent glaucoma, dry eye syndrome, and cataracts, as well as contributes to healing and fighting cancer. Neat!
What about how far these people can look, maybe the eyes adapt to having to only look in distances of .5 to 100ish meters because there are buildings everywhere
Farmers?
@YamFestival Well, there might be an inverse correlation between seeing _far_ things (as you might outdoors) and myopia.
@@jeff__w If it was that easy, science would have figured this out already a century ago.
@@Luxalpa
No it wouldn't, as you can see they aren't sure what the cause is even now, and some of those answers are even simpler than that. The simplicity of an answer doesn't make it easier to get to. What matters is what we originally think the answer is, how far away that is from the truth, and how easy it is to find the truth using available methods for studies.
I moved from a pretty crowded city at age 6 to a relatively sprawly suburb/rural area, and only then became myopic (and took a decade, still living in the burbs, to become "highly" myopic, where I have stayed for *another* 20 years). But my eyes DID turn from blue to hazel in response to the increase in sunlight, especially from lateral angles where buildings in the city blocked it. Took about two years.
THANK YOU for talking about this. It blows my mind how this is not a HUGE THING. I am genuinely afraid that I am going to be blind by 50. WHY IS NO ONE ELSE WORRIED ABOUT THIS ??! If they are, why the heck haven't I heard them talking about it?
Ayverie Ablaze I agree. It is very important.
I suspect that it doesn't get more attention because most sufferers get corrective glasses easily (at least in developed countries, which is where "more attention" seems to matter), and wearing glasses is well accepted, even fashionable. It doesn't strike people as the problem it really is.
Ayverie Ablaze well I was born with bad eyesight so I was screwed from the get go.
Ayverie Ablaze cause the main cause of blindness in the elderly is macular degeneration. it's unrelated. however I know what you're getting at mine only stopped worsening a year or so ago at 25
I am 27 and have bad eyes. They finally stopped getting worse a couple of years ago, but from around 6th grade to 12th grade, they went from normal to me being horribly near-sighted. Now, without my glasses, anything more than arms length away is a blur of color without shape and definition. I’m worried I might one day be so blind that losing my glasses means I can’t function.
Love it when youtube makes fun suggestions for me during a pandemic. (Also love sci shoe this was actually super interesting)
I love that you lot talked about this, if you are looking for a good follow-up topic, there is a lot of propaganda and debate around some old early 20th century science saying that improving vision through eye exercise is possible. Some folks even quote the bates method or other methods from that time period. I would love to hear what ya'll come up with about that stuff!
So, staring directly at the sun isn't good for our eyes but not enough exposure to sunlight isn't good for our eyes, either. Where's the butter zone?!
Also, #NearsightedMasterRace
+Ganaram Inukshuk just go outside, without staring in the sun?
+Ganaram Inukshuk This video didn't say anything about staring at the sun being bad.
I'm referencing the common knowledge that staring directly into the sun isn't good for your eyes as the extreme end of exposing your eyes to sunlight.
+Ganaram Inukshuk I think there was a scishow episode that talked about how bad staring at the sun is.
BobIV123 Yeah, that was it.
Science explains why smart nerds wear glasses...hmm..
kitty kat irony, huh.
As much as I want to believe I'm snare I still can't do 6th grade math effectively so yeah.
Soup Medic, I believe that we can extrapolate your math skill or lack thereof by the fact that you stated you are "snare". Keep on keeping on, you can be as "snare" as you want.
baj800 leave me alone I'm a Highschool dropout with no friends, I don't need this negativity.
Thats just a Hollywood stereotype
Fascinating. I should spend more time indoors to correct my farsightedness then.
I'd like to see some data about "this wasn't a problem in earlier times." The literacy rate in earlier times meant that more people didn't wear glasses not because they didn't have myopia, but because they didn't need to do any close visual work, like reading. In almost every society, eyeglasses become more available to regular people starting almost around the same time that people start moving from rural areas into cities and suburbs. This includes the shock industrialization and commercialization from a previously agrarian China. I think myopia has always been a problem, but we're just addressing it more now because there is more demand of people who realize they could see better if they did something about it. Literacy rates are now higher and text on devices are now smaller. We get ourselves glasses and other eye corrections more now not because we need them more, but because of FOMO.
Glasses didn't become available because of demand. Glasses were expensive and virtually unavailable to the average person before glass could be mass produced in industrialisation.
@@xfranczeskax I think "demand" is a tricky concept in a society and economy where people don't know they need glasses to see clearly, or if they don't want them because they ain't the readin' type. In some cases, you can see moderately well, but just get headaches if you read too much. You're in the 19th century and go to your doctor and say you have headaches. Does he prescribe glasses? No, he prescribes the fantastic new painkillers of the day -- cocaine, pot, opium, etc. I think when the technology to make glasses cheaply caught up with the people who wanted to read newspapers or the Sears catalog or a contract, there was that kind of demand.
Yeah, if it weren't by the fact that I can't read well the letters in a blackboard, I wouldn't even noticed that I needed glasses. I only really need them for three things, school, driving and watching the subtitles of a movie in the tv. So if I were a farmer in old times I would never have noticed, but at least seeing leaves in HD is nice.
I… don’t think the original comment is describing myopia. I can see very clearly from 2cm away to 10cm away, I don’t need glasses for that. As a kindergartener I could see from 2cm to 50cm away. Literature is easy with myopia, outdoor work is hard. Even just errands.
Myopia means anything far away is a giant blur. That was always a danger and a problem for me, because it’s literally unsafe to walk outside without wearing glasses. In medieval times I would likely have died as a peasant child, expected to work and play outdoors but unable to see obvious dangers in my way. So since I was four years old I had to wear glasses in the playground and learn to not drop them, but I could rest my eyes from the glasses when doing homework (tracing lines, practicing writing letters, and working on assigned reading).
Far-sightedness, on the other hand, was unlikely to be a problem except for maybe seamstresses, scribes, illustrators… I can’t think of many medieval occupations that would be seriously affected.
He was specifically talking about an epidemic of nearsightedness though. If you're nearsighted, you don't need glasses to read. You need them for distance, like how I need them to read signs on the road while driving, but I have no problem reading your comment on my phone without them.
I've been nearsightedness since I was a kid... Been outside almost everyday when I was younger... Still wore glasses.
Techguy404 What age would you say is not a kid anymore?
Because your nearsightness is caused by genes .
Same here.
"X causes Y" does not imply "not-X causes not-Y"
Genetics still play a decently large role in the matter, and I guess you got the short end of the stick, although at least you spent a lot of time outdoors or else it probably would have been even worse
Could be on the rise even more as kids can't even go to the park by themselves anymore without someone reporting it to the cops.
that sounded really sketchy tbh.
Someasshole1000 your does but there are cases where parents trust their kids to walk to their friends houses just down the road and the parents get cited for that shit.
what are you even talking about i wonder
From what I can tell only in America
Haha, I did feel concerned when I saw a child, around 8yrs old, walking alone to school. I'm a millenial so I rarely walked completely alone as a kid, but a group of kids that age was pretty normal.
The mention of being outside affecting vision is interesting, considering how weather can wear on your eyes over time.
I most definitely believe that your environment will affect your eyesight over time.
This is so fascinating. You could probably draw a correlation with poor mental health in childhood and nearsightedness. I spent plenty of time outside as a kid, but I definitely have some difficulties with brain chemicals like dopamine and serotonin, and always have.
So I just wonder if you could draw the same sort of lines with myopia and childhood mental illnesses that affect dopamine responses.
"and spending more time indoors in dim light could be to blame"
*opens curtain *
*Me already having glasses*
same same sAmé
To me it seems that the obvious next step would be to develop indoor lights that simulate sunlight, preferably without the UV, or lower levels of it. And do tests involving those lights.
just go outside. Tech is not the answer
@@lovepeacebliss most people are stuck inside for 8-12 hours a day for work or school. If we can develop lights that prevent eye degradation, we would be fools not to. Yes, tech is the answer.
@@archer9338 stuck inside? Are you talking about a facist regime, jail cells, solitary confinement? For me, health goes above everything. So to these people I say open a window, move into a different cubicle, get a different job. Tech will never replace the real thing. No matter how much marketing they do.
@@lovepeacebliss What about children at school? It's not quite a jail cell but it's pretty close - they don't have a choice about whether to be there or not, it is all decided by the adults in their life. Of course it'd be good if we could restructure schools to give kids more natural light, but if the real goal is stopping eye damage then it doesn't matter whether that's achieved with natural or artifical light.
@@lovepeacebliss you are clearly a fool. I'm done talking to you.
Very nice! Thanks.
I would love to see an updated version of this video to reflect more recent research, if there is any
So why am I farsighted?
+Mike Paquette My parents told me that I'm farsighted because the doctor squeezed my head too much when my mother was trying to give birth to me and my oversized head, so my eyes ended up the wrong shape and now I've got +5 in one eye and +6 in the other, and 2.5 astigmatism on each.
That's interesting because my father reports my mother thought that the doctor who delivered me squeezed a little too hard with the whatever it was.
I was actually trying to find a cause of mental illness(es) like, "was I ever dropped or suffered any kind of head trauma?" kind of questions.
***** Yeah, my mother said something about some sort of oversized tweezers they used to get me out of there too, I was a stubborn one apparently. Infant skulls are indeed quite soft and maleable.
Though I haven't exhibited any sign of mental illness yet, other than some minor dyslexia. Causes of mental illness tend to be a bit more complicated than this.
+Mike Paquette i think that rather being sunlight the fix, is having a "no focus point" the fix.
think about it, when you're in a house or most generally studying and on the pc, you have always a fixated point where you focus, almost the same distance, on the other hand, when you're outside generally your focus point distance changes drastically every couple seconds.
now i'm not sure about the medical points i could give, but i think that focusing the eyes at the same distance point for too long-be it in close or long distance- can give eye problems related to focusing them.
Very interesting
I guess this is why the "smart kids wear glasses" stereotype went around.
stereotypes are usually based in truth no matter how upsetting they are
@@Alex-uy7pc more like stereotypes are often self-fulfilling prophesies... i.e. a person *believes* they should be a certain way, so they do
@@Kahzu Stereotypes are usually based off of a minority of a population. That minority could even be 1 person.
@@WanderTheNomad you've simplified it far too much for that statement to have any meaning in educating someone on stereotypes which appears to be your goal. which i find funny as stereotypes are in themselves oversimplifications of an idea person or thing. you're basically stereotyping stereotypes. lmao
en.wikipedia.org/wiki/Stereotype
also why are people even replying to this comment thats two YEARS old? and on a video thats almost twice that
Well, there are cases of kids who were held back a grade because of poor performance only for parents to realize they were near sighted and couldn't make out the chalkboard during lessons.
This is really interesting to me, because I didn't need glasses when I was little but as I progressed through junior high and high school I needed them worse and worse. That correlates with me gradually spending more time indoors, and also with growing depression symptoms (lower dopamine).
That's really interesting. My mom is nearsighted, and grew up in the Arizona desert and would play outside. I wonder what causes it even in situations where someone is getting a lot of sun.
Scishow - "Good thing sunlight is, free!"
Government- "Lol one sec"
TheKerberoses i think you mean corporations lol
If somebody is going to start charging people for sunlight, or air, or anything, it'll be a corporation. Maybe even on Earth, when they've finished ravaging the environment to the point it can no longer easily sustain human life.
Next thing you know the commiefornians are gonna start taxing sunlight
it's more likely to be a company like nestle to try to sell you something that is free.
dfpguitar the problem with a company trying to sell it to me is they can’t force me to buy it, they can’t point guns at me and take me to jail if I don’t pay, the government can and has
Just a theory as another possible contributing factor is that short of staring out a window when outside you are capable of looking much further away than indoors and quickly transitioning to a closer focus a simple exercise that may naturally help the eye develop its capabilities.
That's my thinking as well. If looking all day at near books makes nearsightedness, then all day looking at a distance could prevent it...or even cause farsightedness
Here's an idea: looking at things far away prevents short sightedness.
Congratulations. Someone already thought of that 500 years ago and they were just as wrong then as you are now.
@@rooney0423 yea. I am too confused. The vud basically said that was false and then continues to support part of that theory in way by telling us to go outside more.
Sorry but it doesn't prevent
There is no evidence no consensus
Thank you for answering my question though:D
Very interesting ! :-)
There's an old proverb in my country, "Where the sun doesn't go, a doctor goes.". Even in older periods, people clearly understood some outdoor activity in natural sunlight can be medically beneficial, even if they didn't understand the exact mechanisms behind it. Well, neither do we, not entirely yet (as you've pointed out). But it's still an intriguing hypothesis and it does seem to add up logically.
At the end, he mentioned that people who went outside more, even when it wasn't sunny, still showed fewer incidences of nearsightedness. Is it not logical that being outside gets you to look at things which are further away and exercises your eyes more?
andrewandrew599 it is certainly plausible and is worthwhile investigating. It breathes some life into the old "overuse" hypothesis he mentioned in the beginning. Near work has been pretty much abandoned as a cause, but lack of "far work" may possible be a culprit.
andrewandrew599 excercising isn't going to just shorten you eyeball. Especially if you're an adult
Looking at objects far away requires your eye to change shape. The change of shape is mediated by muscle movement. I have no idea why you are relating physiology to being and adult.
Thank you, PBS.
Thank you so much for the great information, sir.
Hope my 10 yr old daughter's vision improves.
She is just 10 yrs, already her eye power is -5. Plz pray for my daughter.
Plz keep sharing such good information. Actually, our doctors will not educate us in detail as u explained.
Um what sun?
+LegoCookieDoggie The yellow one.
+Victor G
But not all games have a skybox with a yellow sun.
Besides, I don't know if there's actually a sun in the outside world. I've never been to that hellish land.
+LegoCookieDoggie I think it's the one that looks like yolk
+LegoCookieDoggie rottel-da-sun
+LegoCookieDoggie A sun is a very bright object that acts as a light source in many games. It's usually a part of the skybox.
Mom was right when she told us to go out to play.
6:22 That makes me think of SAD or Seasonal Affective Disorder. It's really a Depressive disorder, but it uses the day/night cycle triggered by light amounts. There's actually two versions-the one most people think of when they talk about SAD where you struggle during the winter due to low light levels particularly in Northern climates; but there is also an 'opposite' version where you struggle during the summer due, why I'm not sure.
I wonder if having some classes outdoors is the answer. Yes, parents can send their kids outside but if school routines don't change, kids will still likely spend the majority of their day inside.
trying to imagine chicks wearing minituare goggles
I feel like that’s defiantly one of the pictures they should’ve included
I'm doing a science degree and when I get back to university I'm going to propose this chick experiment cause its be so cute
@Sergio putting goggles, or at least vision-blocking pieces/equipment, onto chicks was common a long time ago, as it kept them from pecking each other and hurting each other (sometimes seriously!). Now, red light bulbs are used in brooders, to prevent them from seeing things that might keep them pecking at each other, like a bloody new feather.
A bit of a lesson about little chicks:
When the feathers first start coming in, there's a blood supply to the part where it comes from the skin, and if it gets pecked, it will bleed. And they will keep pecking at a blood spot, up to and including killing the bleeding chick. So, glasses or goggles would be a vast improvement to letting chicks get pecked to death. And that means literally pecked to death. I have seen the results, long ago, and it is horrific. Not something someone forgets about.
Stuart little?
i imagined them taking vision tests at the end of the experiment
"ok, which is clearer, 1.. or 2?.. 1.. or 2.."
"quack!"
"kevin you need to take this more seriously"
Well... that explains my near sightedness. I'm a freaking vampire, I hate the sun and its heat and I prefer staying inside and the night. My older brother isn't nearsighted, he's more outdoorsy than me. Oh, I also have a higher education degree than he does. Makes total sense now
I totally relate. I'm a vampire and I have nearsightedness too
"I...I live among the creatures of the night!"
Great finding! Does that mean too much light like looking at your bright device all night could lead to farsightedness? (Trouble seeing things farther away?)
I remember getting my first glasses at 18 yo. Ive had been experiencing blurring in my vision since 7 or 8 at school it would be hard for me to copy notes from what the teacher was writing. Having my glasses for the first time felt like those heartwarming videos where colorblind people would see color for the first time lol made me teary and would look around my surroundings i didnt know it was this clear. Also am a first born so i can confirm with that part about parental investment.
Yeah, it's like jumping from 360p to 4k in a youtube video, absolutely stunning, i get to experienced it again recently as i changed my "obsolete" glasses to a better one, the changes is real, although it'll be the same again in the a few months i bet. Also i'm last born and somehow i'm the worst in term of good vision among the 3.
Please make a part 2 of this video in 2019
Wauw! This is one of the best videos which I have ever watched in CZcams so far!
This has so much merit, I've noticed that in Michigan (where I grew up) there are a lot of people needing glasses around therand that's the 2nd least sunniest climate in America. Where I am currently (Oklahoma) is one of the sunniest places in the country and I've noticed far less people walking around with glasses. If I have kids I"m making them go outside all the time
This was so interesting.
MICHAEL YOUR HAIR IS BROKEN!
+Bolor The Rat SOMEONE, GET THE DUCT TAPE!
+Bolor The Rat I like it.
+Bolor The Rat I don't get it...
+Bolor The Rat he looks 40 now.
I was born very farsighted so nearsightedness helped my eyes return to normal lol
this video made my eyes water
Dude made the nerds and glasses / "glasses make you look smart" connection. Very cool.