Eye Accommodation Made Easy
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- čas přidán 19. 02. 2013
- This video will cover the basics of eye accommodation. Included are the basics of the suspensory ligaments (zonules), lens, and ciliary body muscle functions with regard to how it focuses your eye.
Ciliary body is like a sphincter. That just made years of confusion wash away. Thank you.
The same thing here for years..knowing its arrangement is the basic thing. Thanks sir
No other video explained the ciliary muscle like a sphincter. I was always confused in the two- dimensional picture of how ciliary muscle contracts and the ligaments relaxed. This bothered me for quite a while but you, out of all the videos I have watched explained the muscle like a sphincter. Thank you.
"The ciliary muscle circles the lens." That just made everything make sense :)
exactly what i was thinking to comment about this video! amazing explanation, thank you!
@@deeac01
U welcome
Yea👍
Your explanation is the best I've found on the internet. It makes sense and it absolutely has to be true. Thank you, sir!!!
This was the sixth video I watched. That was the best explanation I needed. Three years of med school and I always forget how that works. And thanks to horrible explanations, usually takes me thirty minutes to re figure it out. You just saved me 20 minutes.
u a doc now?
Its not every time a person comes on CZcams and finds just what they're looking for.... This was just what i wanted.. Thanks for taking time to do this and upload it.
Comparing the ciliary muscle to a sphincter really helped a lot, great explanation!
Awesome, you clarified this whole topic for me when you said " sphincter". I know now that relaxation of sphincter causes tension in the ligaments. This bogged me down on this topic so thank you.
I had been struggling with this concept for days.... this just made it so much easier to understand.
You went straight to the point and made everything easy, thank you very much. PERFECT ILLUSTRATIONS.
This needs 1,000,000 views. All I needed was for my physio book to do was explain the ciliary muscle like you did and this would have made sense a long time ago. Thanks.
I've developed Accommodative spasms due to my new job so I've been doing research. Thank you, this really helped me to understand it a lot better.
Thank you brother i really never understood the concect in my first year of mbbs even though i tried different books but now in my third year, i found your video and it all makes sense to me. Thanks a lot.
man thank you so much. 3 years of confusion cured in 4 minutes.
FINALLY understood the topic! Thank you!
Finished off my anatomy without ever understanding how the suspensory ligaments really were loosened when ciliary body constricts, always had trouble with understanding how. I was always thinking in a too 2-d organization, but as soon as you did the gesture with your hands at 2:54 it became so obvious to me. Priceless, wonderful feeling, thank you so much! :D
100% agree. Also my lightbulb moment after 3rd video of 'mmmeh, still don't quite get this'. Sweet. Done. Moving on.
Actually the video didn’t help me. What helped is the diagram with a coronal section which showed that when the ciliary muscles contract, they become shorter and *thicker*, and hence the distance between them and the lens decrease. Because of this, the zonules tension decrease (as the zonules don’t change their length). As the zonules become looser, the lens are allowed to be thickened. (When the muscles relaxed, the zonules stretched the lens and make them flat.) Anyway, as the lens thicken, its power increases.
(Pretty sure you don’t need this anymore haha considering it’s been 5 years. Just wanted to share what helped me :) )
@@nhnhnhnhnh exactly
@@nhnhnhnhnh Very nice additional explanation. Indeed, the video did not fully explain how "contracting" causes the "loosening", which was tough for me to understand at first, too. I actually had to make a drawing for myself, so finally the penny dropped.
It is super important to understand this. To also understand how in most cases myopia initially develops due to ciliary spasm (pseudo myopia)
OMG, you are a life savor. I'm a psych major and I have a Sensation & Perception Exam tomorrow morning and I just could not understand how the the relaxed ciliary muscle in turn forces the suspended fibers "zonules zinn" to become stretched causing the lens to remain flat allowing the eye to be focused on distant objects. However, when the lens needs to accommodate to focus on closer objects the ciliary muscle contracts, reducing the tension on the "zonules zinn", enabling the lens to bulge or become round. By depicting the eye from a different anatomical direction I was able to better understand the exact motion of the ciliary muscle as it contracts. It's important to fixate on the idea that when the ciliary muscle contracts it actually grows smaller essentially trying to suffocate the lens almost. As a result the suspended muscles of the "zonules zinn", who were once stretched to maximum potential which were pulling the lens to a flat state now loosens it's tension providing the lens to take on a more convex shape allowing it to adjust its refractive power to fixate on the closer object allowing it to stay focused on the fovea. Wow, the power of the internet...why even go to class.
P.s. I guess Sensation & Perception does make the world go round!! Lol. God Bless:)
This was more useful a description than the video, thanks.
I didn't get the video until I read your summary!
Needed this for my exam in 2 days ,Thank you it makes so much sense now.
Thank you! Finally made clear :) The different angle really helped
Perfect explanation thank you. My text book could not provide an explanation as to why ligaments get looser when the muscle contracts. Sphincter comparison did the trick!
thanks! finally understood the relaxation principle of any radial/sphincter muscle.
I was just searching for this video,,,thanks sir
Very nicely explained. Cleared my confusion. Thanks
Just what I wanted!... Thank you soo much for this video... really helped a lot😁
Awesome video! Thanks for keeping it to the point!
Thank you for the informative video :) It was just what I needed to prep for my test.
I havd struggled to make my students understand this until now, thank you
Thank you for this simplified explanation
amazing!! clear and precise thank you so much.
This video helped explain why a phone and a TV have such different viewing experiences even if they both have the same resolution, picture quality and take up the same area in your field of view
And finally I understand it 😅😅
Thx very much
Thank you! Just got this now! I never got the ciliary muscle before this...
finally understood! Thank you so very much!
Appreciation, it was easy to understand 🙂
It finally makes sense! Thank you!
i C it so clearly now. damn that was hard to figure out. Good teach. Thx.
you just made my life easier. thanks
Thanks! this video finally made me understand
really helpful man :) im a medicine student and i just had a conflict with my roommate-which is also studying medicine- and he told me the complete opposite of what you explained just 2 days before our big exam :D so im just really happy for knowing that i studied this subject in the correct way :)) thx for uploading :))
Hey
You will make a great eye surgeon
Thanks for the feedback!
Thank you sir, now all is left to pray I pass the biophysics exam
helped me visualize the accommodation. thanks...
Thank u so much. Now I know why they got presbiopia
so which one is considered "unaccommodated" when the ciliary is relaxed or when it is contracted?
Thanks, that was really helpful
simple and helpfull, thank you
I have minor prescription. If I don't wear glasses and look at something blurry, would that put a strain on my eyes if I don't try to see and still relax my eyes? Like would my eyes subconsciously try to see and strain my eyes, causing my prescription to increase?
Isn't it the other way around? When the ciliary muscles contract and stretch the lens its for seeing up close?
I just had an eye test done and my Convergence is 8cm and my Accommodation is 15cm. Unless I misunderstand Convergence, this means objects become double when they reach 8cm from my eyes. But how was my Accommodation measured in centimetres?
Thanks for helping me with Biology homework
Thank you for that sir!
Thank you so much!!!!
Actually - it is easier than that.
The entire eye, changes its refractive state, as it's average value of accommodation is changed.
Proven in objective science.
The entire eye - is a dynamic control system.
You can bet on it.
Life saver !!
Rest assure that this condition is an early onset of chronic open-angle glaucoma and sometimes could happen prodrome (before official glaucoma diagnose)
Thanks man!
Made my day 👍
That was helpful thanks alot
thank youuuuuuuuuuuuu soooooooo much!!!!!
Your explanation is so simple and amazing thank you that's what I exactly needed
Thanks for the great feedback!!!!!
Phenomenal
THANK YOU!
a nice lecture
JUST A BIG THANKS !
Good upload, thank you :)
Amazing
Actually the video didn’t help me. What helped is the diagram with a coronal section which showed that when the ciliary muscles contract, they become shorter and *thicker*, and hence the distance between them and the lens decrease. Because of this, the zonules tension decrease (as the zonules don’t change their length). As the zonules become looser, the lens are allowed to be thickened. (When the muscles relaxed, the zonules stretched the lens and make them flat.) Anyway, as the lens thicken, its power increases.
(Pretty sure you don’t need this anymore haha considering it’s been 5 years. Just wanted to share what helped me :). I’m still grateful for the video though so thank you for making it.)
Really Good explanation. When the ciliary muscle sontracts, it shortens and hence thicken. That one sentence answered my questions. Thanks
Great help
Finally, I understand now.
I dont understand biological terms but I get the muscles and lens you explained it well
what is horizontal vergence test? 水平聚散能力檢查
thank you very much :)
Thank You
please there is a mistake ..the ciliary muscle is only innervated by parasympathetic system and contain only M3 receptor ..thee is no B2 receltor
There is sympathetic innervation to the lens. Under stress, eye will automatically focus on "distant threats"
Thanks alot
if its flat like a pancake does that mean the eye will be looking at a longer distance object?
Will George Yes, pupil dilation(mydriasis) is for far distance vision and pupil constriction(myosis, as seen in accommodation) is for near vision. Hope that helps.
that board moving around was weird, made my ciliary muscles go all over
fuck you!_ljahaha
can you train this muscles to make your eyes focus faster?
well, that's what you do as a baby. If you look at newborns, they look everywhere and keep focussing and unfocussing; that's training but once we've got it, it's as fast as our brains are willing to process. You might be able to train it through meditation and/or martial arts but it should be (slightly) faster than a normal brain can process the focussing and in that time, we get the Stopped Clock Illusion.
nice explanation, can you give me the references?
Circular muscle fibers of ciliary body exhibit a sphincter like action in a way that they decrease the diameter of circular ligament attachments.
thank a lot
👌👌👌👌
GREAT
Not that anybody cares but I got a BTS fancam ad after this video...so much distractions when you're suppose to be studying 😭
I got the bts x maplestory one 😭😭 I'm happy but don't wanna be distracted either lol
Bro❤❤❤❤
thx
ccccciliary >> ccccontraction >> acccccommodation (make the lens ccccircular).
Thhhhhhhhhaaaaaaaaaankkkkssss
Ciliary muscles pull lens= good for far vision
Non accommodated-ciliary muscles relaxed,taut suspensory ligaments.
He said sphincter for ciliary body. That's for iris.
i love you
اوك
He was a little liberal with the use of "sphincter", but the general point of the lecture is correct
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THANK YOU!
Thanks alot
He said sphincter for ciliary body. That's for iris.
He said sphincter for ciliary body. That's for iris.