ฝัง
- เผยแพร่เมื่อ 22 มี.ค. 2015
- ** Peer Reviewed (through LearnFM, the Shared Canadian Curriculum in Family Medicine, learnfm.ca) **
This is a video that teaches how to check patients' distance visual acuity using Snellen charts. It is aimed at clinical learners unfamiliar with visual acuity assessment. IT IS NOT FOR CHECKING YOUR OWN VISUAL ACUITY. It simply teachers how to check someone else's visual acuity. For more great clinical education materials, go to learnfm.ca, the Shared Canadian Curriculum in Family Medicine!
I'm presently carrying out a research on information resources for visually impaired students, i kept seeing 20 this, 20 that in all of my readings, decided to check out videos here on you-tube to understand what all those is about, and this really did justice to my comprehension. Thanks
Dear Okoli, wow, this is very generous feedback. I am beyond thrilled to learn how this has helped you and, by extension, your work with students with visual impairments. This is why I love open-access learning resources: they go out into the world and can have good and unforeseen impact. Also, this is good affirmation of my style: to explain why things are or why we do them a certain way and not just demonstrate. Can you subscribe to me, and then I'll try to email you directly to learn more. Take care!
am i the only one whos doing this because i got a appointment in a few weeks?? 💀
PlayGamesMaster me
PlayGamesMaster Same
I'm practicing ;)
Dude Im having it today 😂..
Same i have it today wish me a luck! :-(
I didn't know there was a whiteboard there I thought he was just righting on the wall lol
+Manatee()5 - I have written on the wall by mistake in the past, but not on film! It took a long time to get the marker off the wall! :)
dkcalgary ehm i want to say something.. I cant even see the E
dkcalgary and im not lying
No Name you should went to optometrist
خلب()5
I’m a new LPN and they did not teach the Snellen chart in my course but very briefly went over what it was used for. This was very informative and to the point of learning it well. Enjoyed this video and would recommend to someone needing to learn how to use it! 👍🏼
Congrats new LPN
Thank you for this video! Very clear on how to score visual acuity. I have my first job in pediatrics as a CMA and I am doing physicals all day and this was somewhat unclear to me until I watched this video! I now can be more confident on how to score them.
Yay! I'm delighted to hear this!
You made it so much easier to understand. Great video! Thank you :)
Video was very helpful when I was learning how to check visual acuity on patients. Thank you.
Thank you so much for this video. This is really helpful.
thank u for sharing! this makes everything clear ❤️❤️❤️
Nice pun! Thanks for the feedback! DK
Thank you for this! Great, clear information!
Thank you so much, I always had trouble figuring this out. No one has explained and taught how to read this chart. You explained it so well. So thankful to the TH-cam platform.
Great!
Awesome explanation Doc! Thank you!
what a fantastic video. i'm an occupational therapist using it for school screenings. Thank you
This is great to hear!
what if that person knows the sequence of this chart?
Hi, that is a great question. In grade 4, I personally memorized the chart so I could avoid glasses, but I was busted when they swapped out for a different chart. What I will do if I suspect it is jump around and point to letters here and there. Finally, if I really suspect it, I might ask them to be checked by an optometrist, who will have a variety of charts, including projected ones, that can't be memorized.
However, usually, I'm dealing with someone who has some sort of eye problem. They want to see and have any problems taken care of. So, I'm not usually caring for someone who is trying to avoid glasses or otherwise minimize any problems with vision. DK
This is a great question. If you suspect it, swap it out for a different chart. If you don't have one, then maybe the best option is to refer to an optometrist who will have all sorts of cheat-proof ways to check visual acuity. The great thing with having a physical chart is you as the clinician DO memorize it, which means you can look at the patient while they are reading it, and make sure they are doing it correctly (such as making sure they are fully covering the eye, etc.). Thanks! DK
There are rondo mixed digital charts. Useful for some applications, but not as essential as you would think
Have them repeat it backwards
dkcalgary S Q U I N T
Great video for learning! :) I feel a lot better about the charting.
Hi, in the video I have tried to explain things, just just tell them at the viewer. So, thanks! DK
Thank you sir. It's a very good explanation to understand it easily
Thanks doc. such a wonderful learning. Easy to understand.
What a great explanation! THANK YOU SO MUCH
Could you please confirm the font size of those letters on the white paper in cm/mm?
Wow you're so Amazing...I learned exactly how to do this..Such a great Teacher...Sometimes people explain things and you still can't get it, but the way you explained it was super easy..Thanks for this :)
This is great feedback - thanks!
Thank you doctor. You were very helpful
I need this guy to explain my whole life... Subscribed ;)
You have a gift of explaining concepts.
Found it so explanatory,thanks!
great!
dkcalgary I can read 20/15 but cannot read 20/100
dkcalgary what does that means
The Duos Gamer wait. So you can completely read a smaller row. But cannot read the row above it (a larger row)? Well my friend, there’s only one explanation.... One explanation indeed..
WITCH!!! 🧹✨
Christopher what about u?
love this. i have a sever astigmatism. this vid enlightened me on how do doctors actually measure eye vision💖
Things are more nuanced with astigmatism (I have it too). That's beyond me. But I'm glad this video explained how and why for the big topics. Take care, DK
Got my eyes checked yesterday; my right eye is 20/40,my left eye is 20/50.......Guess I need some glasses 😅
Lmao Jungkook is jungshook in the thumbnail 😂😂💜
I'm 20/400
You chose the wrong path.
Now tell me your latest prescription
-1 or -2 or -3.
Bro still have time. dont follow these fucking culprits optometrists.
You can reverse your myopia .
@@Ethane077 how? How can we improve myopia
I can read the 10th letter stuffs in each eye but my right eye missed 1 letter
Loved this succinct and concise education session. Thank you!
This is helpful feedback! Thanks, dk
@@dkcalgary how much distance I must have to see it ?
Asked how do I figure out what readers from Walmart I would be. . I am home bound,
thank you it helps many students like me :)
A very good description. Thanks doc
Great video, thank you for posting!
What a nice and clear explanation, thanks 🙏
You're welcome!
Wow I’ve learned so much this was a great video
Thank you! Thank you! Very detailed and informative information!
Thank you Sir. This video was really helpful. Love from India😃😃😃
Hi, glad you liked it! DK
I don't wanna be an eye doctor or test peoples visions or anything but I watched this whole video.
Hi, glad that you liked it! DK
Hi, wow, that is pretty keen! DK
Nice. Ophthalmic Technician is a great job, that is always short-staffed
i remember reading all those perfectly during my dads eye checkup and wanting to wear glasses.
me tooooo I rmb they did an eye checkup at my school and I lied to the ppl and said I couldn’t see any of the letters and they sent a little home to my mother telling them I need to go to an eye doctor to get a checkup and my mother told them I can see and stuff bc she knew I was lying but they told her she needed to go so I went and I ended up getting glasses and now I wear glasses and I’m blind 🥲
you are a really good teacher, now I know how to do visual acuity.
Great! Thanks!
Very clear! Thank you!
thank you!you made it clear for me..
Hi, thanks and Nice pun! DK
Thank you! Encountered Kindergarten Test Chart for the FIRST time. Awesome. :)
Thank you so much! It was a great help!:)
Thank you this really, help me as a medical assistant:) in my first day at work.
I’m a medical assistant too!
Very clear explanation, thanks!
LOL. The eraser. Haha. Watching this on panic mode because I've got PHYSIOLOGY practicals tomorrow huhuhu
Thank you! Learnt something!
Thank you so much... Very informative..thank you for your time
Great video. The only thing different I was taught (when I was training in St. Louis) was if they only got two letters correct on a line then, as you said, call it the line above: 20/50 but give them credit for the two they got right. So it would be 20/50 +2. Maybe that's just a U.S. thing...
That's exactly what I was trained to do as well.
If I can't see the letter do I just say "I can't see it."?
Am I allowed to squint?
People will squint, so you score what they can see. DK
Thank you. This was awesome
Thank you. I needed to understand this better & you made it enjoyable to learn. Appreciate it. New subscriber. :)
I say Zed and i am from the Caribbean. Hahaa. I enjoyed this video thoroughly. Thank you!
+Kay Will Go "Zed"!
Im from carribbean too
I'm from Zambia and i say Zed too
Don't have a perfect eye sight? Well i suppose you can try to remember these words. ;)
Its Rizl
Lol if you have bad eyesight but good memory, you're good xD
then you miss the whole point of this test
Well, I suppose you can enjoy further macular degeneration. ;)
Its Rizl ok
I did that in 5th grade and avoided glasses I have been lucky cuz I’ve been told I needed them for a month now and I just continue to sit in the front of the room and the nurses bad memory
Very helpful! Thank you!
Ty Dr! excellent explanations!!
Thank you..this was very helpful...and u really took your time to explain
Thanks! dk
Hi, this is good feedback. The key gap I try to fill is explaining WHY different bits of medicine are done the way they are. Some people like that extra context, some don't.
Thank you for explaining how to read a visual acuity chart. It made things a lot clear. I do have two questions though. What if you do not have the space to measure out 20 ft distance? How can you check there acuity then? Also, what are the numbers on the right side of the chart for? Thank you.
Great questions! You can do 10 feet and then ensure you adjust (so if someone read the 20/10 line perfectly at 10 feet, it would become 20/20). Eye clinics will have fancy mirrors set up to give a longer distance too. The numbers on the right are so you can say, "Can you read line 8?" I find because they are on the right side, it is not intuitive for anyone.
This is the best informative video I've see!! Thank you so much.
You are so welcome!
Thankyou doctor! Extremely helpful.
Thank you ! very helpful
This was awesome. I am currently in Ophthalmic Tech School. Explained clearly!!
Wow! THIS is a prestigious endorsement- thanks!
... I'm seeing this video so I can reverse my myopia! I hope you can tell your patients they can reverse it if they want to! 😃
After 6 yrs ago I still come back to this video . Because dr explain so well /:)
Wow Arianni! Thanks very much!
Very informative. I always wondered how this worked.
I'm delighted to be of service! Thanks, David
I thought that big E was a dragon from 20 foot.....damn :/
lol your comment made me laugh :)
:) I think you should drop by your health professional to get tested, though. Take care, DK
sometimes it looks like a D
Last time I tested it actually, I could only read the second one
@@drakesayshi3321 I almost cant read the top E. The eye doctor was like, holy shit.
does Snell Chart have 6/5 vision letters in the last line
This was helpful. I think I might be nearsighted so yeah. Thanks
you just saved my life. my practical is tomorrow!!
good luck! - dk
I was so unsure what the meaning of the denominator was in the scoring system. Thank you so much for clearing this up!
Happy to help!
20 ft?
To anyone seeing this:
I checked a little on the internet and yes, the "EMI Snellen Chart" is supposed to be used at a distance of 20 feet (6 meters)
@@woke657 how many steps for that
@@woke657 yes but the chart would have been a lot bigger in person
Thank you for this. Highly appreciated
I haven't rubbed my eye over 5 years and I still see well and I got all of them correct and 1 mistake thank you for helping my eyes
Hi, Is this test an optimal test to check for double vision problems with one eye or is the black background and white letters more appropriate to check for double vision problems?
I have gone to two eye doctors and they put me in front of a digital white screen with black letters; then , they precede to take measurements with the phoropter.
When my new glasses were ready I noticed that I was having "ghosting of the image" aberration.
I only notice this aberration when I look at a black background and white letters, but not in the case of white background and black letters.
I think there is much lacking in the manner in which eye exams are conducted, a travesty in this, the 21st century.
thanks doctor! im going to eye doctor in next few weeks :D thats helpful
Hi, this video just explains the process; it's great that you're going to get check out. DK
im goining today-
@@desirod_15 rip
@@desirod_15 ive done it,got 7/10
@@meandmyfriend7762 I got a 200- but my glasses come in soon and i cant wait :D
Loved this very useful because I started a job as a Medical assistant
Hi - in fact, that's why this video was made! Our clinic had hired some new medical assistants, and because of my emergency background, I was asked to teach them this stuff. Great! Next year, we had some more hires and was asked to teach again, so I thought, "This is a great time for a teaching video!" And the rest is history - the most viewed visual acuity video on youtube, as far as I can see. (See what I did there?) :) DK
Thank you for simplifying this
You are most welcome
My video quality was 140p and I thought I had a problem at first
😂
when you ask a patient to read the letters, does this mean they should be able to see the letters crisp and clear? or just that they can see the letters a bit blurry but sufficient to read it? My understanding is that you want the vision to be able to read it without any blurriness?
Ideally no blurriness, but you score them based on what they answer, blurry or not. If someone needs glasses, an optometrist would try to get them to the right level of correction without over-shooting.
thank you, I learn a lot. love to see more videos
very helpful!!! thank you so much
You're welcome! dk
what does it mean 4.50? is it realy bad?
You kept saying "Zed" and I was going crazy I was like WHAT THE HECK??? THAT IS A "Z"!!!! Then I learned that other countries say Zed and I felt dumb.
Resolute Films hes american, hes just a damn hippie
American or canadian. Sounds like he has a bitof accent
TWrecks He's Canadian... I think...
The "zed" comes from the Greek word "zeta" which is a more accurate name for the letter. It's only called "zee" in the US because the guy who wrote the alphabet song wanted it to rhyme lol
Hi, now I know where Zed comes from. Awesome! thanks, DK
Thank you! Very refreshing and your efforts in making this video is truly appreciated.
HI, you are very welcome! DK
Great video, thank you
Why would a person cheat on an eye exam ? They only exam no one ever did
Bobby Urkevich some people really don’t wanna get glasses like kids usually can avoid it
Yup. As a kid, I didn't want glasses and cheated in Grade 2 or 3.
I know people who did the opposite because they wanted glasses... Yeah I don’t get it either
@@dkcalgary Hi Doctor, quick question. What does “hand motion” mean for a sight diagnosis?
I was expecting to see 20/20 or 20/200 or numbers the doctor said this is the official way to describe if you are unable to see even the worst case numbers. But I can’t find any reference to “hand motion” in any eyesight medical documentation.
My right eye is like... perfect vision but then my left eye is blurry with things farish away with things that my right eye can see.
HI, make sure you get checked out. DK
My both eyes also cannot see farish away but when i go to doctor he took my eye test and i answr it clearly but still i cannot see thing from far away
Same I get bad headaches and eye aches plus I can’t see at night
Same in my right eye.
My right eye is near sighted and my left is far sighted
Great video, thank you so much!
You're very welcome! Take care
Finally, I get it. Thank you, sir!!!
This video explained what I had often wondered about. What does 20/20 mean. So now I know that it's for each eye. One eye could be 20/20 and the other 20/30 ,etc. So, I guess someone with good vision in each eye is 20/20 20/20.
Hi, generally, I report the score for each eye, then report the score from when the patient does the chart with both eyes open. So it would be something like:
R: 20/20
L: 20/30
Bilateral (both): 20/20-1
@@dkcalgaryI just saw your response today. That's interesting. I'm pretty much blind in one eye abd beed a strong prescription for my good eye.
I'm sorry to hear this, but pleased that it sounds like you have good professionals taking good care of you.
My left eye im pretty sure with eyeglasses is 20/20 but my right may be 20/30
I don’t think 20/30 I bad but it best to read below the red line
THANK YOU DOCTOR
Thank you for sharing this .
You're most welcome!
My visual acuity is 240p.
I couldnt read the top one. My eye doctor was like, Seriously? LOL
Lmao blind fuck
@@somerandomguyonlineforsome7870 Yeah you got that right LMAO
Indiana made it illegal for me to drive without corrective glasses LOL
@@rodneykuhn249 imaginé
@@somerandomguyonlineforsome7870 Here in Indiana, theyd charge me with Impaired Driving. LoL
Thx doctor for your aid we really do pre your help
Great video, Thank you for sharing
In my left eye, I can't see the letters im just 2 feet away and in my right eye I can see until the letters L P E D is it bad😟😢
Hi, I think you should get checked by an eye health professional. Take care and best wishes.
We had a health screening at school and I got 20/100 in my right eye and 20/36 in my left (all with my glasses on)
how
Thank you I think it would be 20/50+3 Coz he was able to read three from the line below
Thanks for the video!
What if the patient have those letter sequence memorized?
That can happen. Anytime I suspect it, I get them to do things like, "can you read line 3 backwards for me". DK
I have a prescription of -6.5 D(right eye) and -6.25 D(left eye) with +1.0 cylindrical, what would be my vision in 20/X format?
legally blind seriousley.
Worse than 20/250
Thank you.! Super helpful.!
You're welcome!
Damn it. what an explanation sir❤
my eyes been bad all my life i cant ever remember having this test done