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Visual Acuity and the Snellen Chart
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- čas přidán 15. 08. 2024
- This video is about Visual Acuity and the Snellen Chart
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Timestamps
00:31 Setting Up a Snellen Chart
01:02 Patient Instruction and Education
01:28 Demo Visual Acuity Test
01:42: Assigning values and documenting Snellen Chart Results
03:09 What does 20/20 mean? Understanding the numbers of the Snellen Chart
03:32 When to see the doctor
03:38 What age group can I use the Snellen Chart With
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Nurses learn how to assess a patient's ability to read and compare that to a normal average adult. Using the Snellen chart, nurses will position their patients 20 feet away from the chart and instruct them through a variety of tests where both the right and left eyes are assessed separately and then both together to determine the patient's visual acuity.
There are many reasons why a patient will need a visual acuity exam completed. There may be complaints of irritation or signs of infection, injury, or declining function. This is a baseline exam that may result in a referral to an optometrist or ophthalmologist for further assessment.
Understanding how the Snellen chart is graded will help nurses accurately educate and document their findings.
In this video, we discuss how to set up your Snellen chart, patient education, and instruction for administering the exam and assigning a value and documentation.
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Omg! Your explanation of how to conduct the Snellen Visual Acuity test is the best video I have found anywhere! Thank you so much!!
Ah! Thanks for sharing that with me. Means a lot
@@NurseMinder I am new medical assistant student, feeling so lost with my clinical skills, been on my own to find help with skill building. Please know, you are making a huge difference with your videos.
I have a skills test tomorrow and this saved me so much time. Thank you so much!
Glad it helped! Best of luck!
Tammy rocks. THank you for showing how to do an accurate eye exam using a smellen chart
Thanks ☺️
Good review.
Currently 20/20.
Put a bright light on it.
Thank you so much. I have a quiz this Saturday, and I couldn't quite understand how to interpret the result if a person has better than 20/20 vision like 20/10. You rock
Woohoo!!!!
You can always sit 10 feet from a mirror that's 10 feet from a snellen test if the room isn't big enough.
Interesting
Thank you for this! Short and to the point! :)
Thank you for watching
Exactly. It was short and informative. She did good.
We have shared your video on our university group in Egypt . thank you so much 💓
Ah! That is nice to hear!! Thanks for sharing
♥️♥️
Very helpful. Thanks.
You are welcome!
This is so wonderful. Thanks for making and posting the video.:-)
Thank you for writing:)
Thanks, ma'am. Great explanation!
Weee thank you! i hope i pass my practical exams
I have faith in you :)
@@NurseMinder Oh my gosh you replied!:< I badly needed to hear this right now. Thank you so much angel!
Very interesting information doctor 🎉
Thank you
Letter size?
20/20 is 0.9 cm
20/40 is 1.8 cm
All proportional.
This is
1 minute of arc,
and 2 minutes of arc.
Good review.
Hmmm. I had not considered this before
"what others can see" that is totally ambiguous and incorrect, 20/20 means to see letters of 20 points high from 20 feet away = 20 feet / 20 point size letters. >> 20 feet / 7.05 millimeters >>>> 20 feet / 0.277 inches. the 20 points were later changed to a subtended 5 minute of arch ratio. Which is no longer a real 20/20 but >> 20 feet / 0.349 inches or 20 feet / 8.85 millimeters. care to see the math? => 240" x tan 5°/60 = 0.349"
Great video
Thanks
we close eye with hand or paper? for reading
Does not matter
The paper ensures the person is not unintentionally using both eyes
Best explanation!! Thank you!!
You are welcome!
Thank you
Top notch content 👁👁
Thanks! Love the eyes
If a patient have eyeglasses do check both w/ and w/o glasses?
Yes you can, and chart the findings as such
Should the measurement be based on what the patient can see relatively clearly or up to what they can just make out even if well out of focus?
Based on what they can read out, once they make 2 or more errors on a line - you give them the reading of the line before
20 feet WTF 😳
If ur chart on A4 size then you should stand at 9.5 feet away from chart. That's universal
@@sanjaykavanekar274 yeah 9.5 feet, not 20
20 feet is the focal point for distance if the test is done closer the distance results will be incorrect if the test room is not large enough a reversed Snellen chart should be used viewed through a Ophthalmic Viewing Mirror with the distance from the patients eyes to the mirror added to the reflected distance to the chart both distances added together should equal 20 foot
@@sanjaykavanekar274 wpaaqqqqaá
00pp00q0w1qqswaw9a9aq9
@@sanjaykavanekar274 i have A4 chart which can I use at 10 feet and 5 feet both and the results are approximately same
Thank you it's very helpful 😘😘😘😘
awesome
Check out the doctor from Calgary Canada. Excellent
Thank you, that taught me what 20/20 means. What purpose do the green and red horizontal lines serve? Is it anything to do with testing for colour-blindness?
"what others can see" that is totally ambiguous and incorrect, 20/20 means to see letters of 20 points high from 20 feet away = 20 feet / 20 point size letters. >> 20 feet / 7.05 millimeters >>>> 20 feet / 0.277 inches. the 20 points were later changed to a subtended 5 minute of arch ratio. Which is no longer a real 20/20 but >> 20 feet / 0.349 inches or 20 feet / 8.85 millimeters.
Hi. What will happen if i have lazy eye problem on left eye ?
Great question. I don’t know it will affect it
thank you!!!
You are welcome!
Can glasses help you from blurry eyes?
Yes, an eye exam will better support your eye health and plan
Bro plz tell me the price of snallen chart🙏🙏
Bro (lol) I had mine given to me. Have you tried an online search?
Thanks
Needed a quick review!
Right On!
Dr.c*
What if i have only right eyes is blurred?
Then you document it as such, and see an optometrist regularly
What do the Distances between the Letters and the numbers, 1,2,3 etc... mean?
I am unsure
That distance is what a person with a normal visual acuity could see those corresponding letters from. For example a person with normal acuity could see the letters well on the 5th row from 20ft(6m).
Hi good Day, I would like to ask if the patient who is wearing a glasses is need to wear their glasess while doing the test??
Thank u
Glasses off and you can do with glasses on after
They do like to see what your current glasses are
I wish I had X Ray vision like Superman!
Me too - could be a bit of fun
Don't we need to open the glasses during reading the Snellen chart?
You can, just note it in your charting that the reading is with glasses on.
Where to buy the snellen chart
Amazon
Can u send the link of the exact product,,,cuz I'm so confused which is the best
Whixh line isit good for driving
This assessment only gives us information about our eye sight. Driving is safe with corrective glasses.
What if a person makes 3 mistakes on line 5? Is that 20/40 -3 or you just write 20/30 for line 6?
If they make 3 mistakes, you go back up to the line before it where they made 2 or less mistakes and use that as the vision
My chart has notations on the right side for different distances for each line ( 30 feet ,40 feet ect. ) should i ignore that and set it up at 20 feet as you did ?
30 and 40 feet are long distances. I wonder if it the 20/40 and 20/30 sight lines
Mine is small handheld chart
Cool
Are all Snellen chart letters the same including at a DOT exam? Or are some charts letters arraigned differently?
There are a few varieties (pictures v letters) but I have only seen this one in practice in the places I work
@@NurseMinder So, is it possible to memorize the letters, back and forth up to 20/40 and pass?
You guys are full of it it should be 10 like the DMV. Here's what's crazy majority of items out here are imploded big.
? Not sure what you mean “imploded big” -
Nurseminder so what is consider passing? Just being able to read all letters above the green line?
20/20 is normal and not in need of eyewear, anything else signifies a change in vision that may need investigating (depending on patient presenting issues and history of natural visual changes)
@@NurseMinder I see TY
@@NurseMinder Nurse what are some things to do to clear blurry vision? Can you take Vitamin A or lub with eye drops?
Have an eye exam first to see if there are any issues that can be corrected with glasses. She your family doc to rule out any illnesses
Video starts at 1:20
Actually it starts at the beginning of;)
what are the dimensions of this snellen chart?
No idea - I gave it away to nursing students to practice
"what others can see" that is totally ambiguous and incorrect, 20/20 means to see letters of 20 points high from 20 feet away = 20 feet / 20 point size letters. >> 20 feet / 7.05 millimeters >>>> 20 feet / 0.277 inches. the 20 points were later changed to a subtended 5 minute of arch ratio. Which is no longer a real 20/20 but >> 20 feet / 0.349 inches or 20 feet / 8.85 millimeters.
20/20
sister where did you get this?? can we print this to use at home?
I just added a link to the video - thanks! I will share it here for you as well amzn.to/33eeFzr
can you give us any pdf? so that we can print.. Amazon is not available in my country
I don’t have a pdf as I had to order it :( maybe google images?
I found a snellen chart by Googling, but it says to print it on A4 paper and keep it from 9 feet away..
Mam i see only e and fp when we see that one are we have to wear power or not
I am unclear what you are asking when you say “we have to wear power” … I assume you mean glasses .. you can assess both: no glasses and with glasses
The scoring ?
You can make one mistake and still move on. Once you make 2 or more mistakes, you stop and give them the line that had only 1 mistake or less
"what others can see" that is totally ambiguous and incorrect, 20/20 means to see letters of 20 points (printing terminology) high from 20 feet away = 20 feet / 20 point size letters. >> 20 feet / 7.05 millimeters >>>> 20 feet / 0.277 inches. the 20 points were later changed to a subtended 5 minute of arch ratio. Which is no longer a real 20/20, but this >> 20 feet / 0.349 inches or 20 feet / 8.85 millimeters.
Love the addition
I have one eye 20/20 vision but other eye has myopia
Thanks for sharing! I have not had 20/20 in either eye (without glasses) since I was a teenager
Every optometrist has an eye chart with a big, "E", on top. Just for once, I would like to have my eyes examined by a doctor who has, "biggies", on the top of his eye chart. Just a nice pair, and I would prefer them in artistic relief, like sticking out from the wall, not just a picture. And, they would have to be pert, not like, "National Geographic", biggies, as they would hang down so low, that they would block any reading of the lines of letters below them. IMHO, any optometrist who would use such a chart must be declared to be incompetent because it would be likely, eventually, that they would misdiagnose a Chinese lady as having a cataract, when she really owns a Rinkon Contenento.
Check out the Kindergarten one
E
Oh eye 👍
I’m scared. I just googled how to convert diopters to a Snellen yesterday.
🧐
@@NurseMinder I don’t know. I know I made that only four months ago, but I have absolutely no clue what I meant to say. It’s fucking gibberish almost
Edit: I also have no recollection of ever watching this video.
64"inches height? That doesn't look like 64"inches.
20/20 feet vision
Thanks u miss beautiful mam
Im pretty lucky that i have 20/10 vision
Yes you are! :)
Do you wear corrective lenses or anything?
@@timothycao3851 no just my eyes
@@jshock1695 damn how did you manage to achieve that bro?
@@timothycao3851 birth
Thanks for your efforts, but May you speak some Arabic Word..
Thanks. If I knew some, I would. I love learning new languages
Wtf 20 mehn cant see it HAHAHA
lol
This chart not maked correct method from 5 minute of arc
I am not sure what you are sharing
Snellen char make a required 5 nodal point 5 minute of arc basis but this board letter looking is very small 6/6 letter size is required 8 mm height and same like width
@@NurseMinder you know 5 minute of arc nodal 5 nodal point
@@NurseMinder "what others can see" that is totally ambiguous and incorrect, 20/20 means to see letters of 20 points high from 20 feet away = 20 feet / 20 point size letters. >> 20 feet / 7.05 millimeters >>>> 20 feet / 0.277 inches. the 20 points were later changed to a subtended 5 minute of arch ratio. Which is no longer a real 20/20 but >> 20 feet / 0.349 inches or 20 feet / 8.85 millimeters.
I’m blind in my left eye lol
Legally blind or are you just kidding around? I can’t read any of them without glasses
@@NurseMinder I’m 100% blind in my left eye
6 meter lmao
a boys haircut
Relevance?
Hope i will make it in my medical tests❤
😊
I have a question u can't read more than 5 th line with glasees what that mean like i can also not read the last line of 6/6 with my left eye but with my right eye i can read it is it bcz of i have a high power in my left eye ???? Pls reply me
It means you may need a new prescription, and an eye exam will be helpful
Which line we should consider for 20/20vision 8 th line or 6 th line
The one that reads 20 feet , 20/20