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

@dkcalgary

3 жыл бұрын

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!

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! 👍🏼

@alemxewar1825

10 ай бұрын

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.

@dkcalgary

4 жыл бұрын

Yay! I'm delighted to hear this!

I didn't know there was a whiteboard there I thought he was just righting on the wall lol

@dkcalgary

8 жыл бұрын

+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! :)

@pew4410

7 жыл бұрын

dkcalgary ehm i want to say something.. I cant even see the E

@pew4410

7 жыл бұрын

dkcalgary and im not lying

@ahgasesatheartandalwaysbe4396

7 жыл бұрын

No Name you should went to optometrist

@laithjamous5940

7 жыл бұрын

خلب()5

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.

am i the only one whos doing this because i got a appointment in a few weeks?? 💀

@happyflamingo1480

5 жыл бұрын

PlayGamesMaster me

@Mollydog-rh9dn

5 жыл бұрын

PlayGamesMaster Same

@Mollydog-rh9dn

5 жыл бұрын

I'm practicing ;)

@MK-cy3ww

5 жыл бұрын

Dude Im having it today 😂..

@ritalovric9808

5 жыл бұрын

Same i have it today wish me a luck! :-(

Thank you so much for this video. This is really helpful.

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 KZread platform.

@dkcalgary

2 жыл бұрын

Great!

thank u for sharing! this makes everything clear ❤️❤️❤️

@dkcalgary

7 жыл бұрын

Nice pun! Thanks for the feedback! DK

Thank you for this! Great, clear information!

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 :)

@dkcalgary

5 жыл бұрын

This is great feedback - thanks!

what a fantastic video. i'm an occupational therapist using it for school screenings. Thank you

@dkcalgary

2 жыл бұрын

This is great to hear!

Great video for learning! :) I feel a lot better about the charting.

@dkcalgary

6 жыл бұрын

Hi, in the video I have tried to explain things, just just tell them at the viewer. So, thanks! DK

Awesome explanation Doc! Thank you!

Thank you sir. It's a very good explanation to understand it easily

Thank you Sir. This video was really helpful. Love from India😃😃😃

@dkcalgary

6 жыл бұрын

Hi, glad you liked it! DK

Thanks doc. such a wonderful learning. Easy to understand.

What a great explanation! THANK YOU SO MUCH

@travelmood4543

2 жыл бұрын

Could you please confirm the font size of those letters on the white paper in cm/mm?

I need this guy to explain my whole life... Subscribed ;)

@evanna1965

6 жыл бұрын

You have a gift of explaining concepts.

Thank you! Encountered Kindergarten Test Chart for the FIRST time. Awesome. :)

Loved this succinct and concise education session. Thank you!

@dkcalgary

4 жыл бұрын

This is helpful feedback! Thanks, dk

@ivans0607

Жыл бұрын

@@dkcalgary how much distance I must have to see it ?

@DaynaHerroz

Жыл бұрын

Asked how do I figure out what readers from Walmart I would be. . I am home bound,

love this. i have a sever astigmatism. this vid enlightened me on how do doctors actually measure eye vision💖

@dkcalgary

3 жыл бұрын

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

Found it so explanatory,thanks!

@dkcalgary

6 жыл бұрын

great!

@cyberbros3031

3 жыл бұрын

dkcalgary I can read 20/15 but cannot read 20/100

@cyberbros3031

3 жыл бұрын

dkcalgary what does that means

@christopheredale

3 жыл бұрын

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!!! 🧹✨

@cyberbros3031

3 жыл бұрын

Christopher what about u?

thank you it helps many students like me :)

Thank you doctor. You were very helpful

What a nice and clear explanation, thanks 🙏

@dkcalgary

4 жыл бұрын

You're welcome!

Got my eyes checked yesterday; my right eye is 20/40,my left eye is 20/50.......Guess I need some glasses 😅

@nvrmxithx

3 жыл бұрын

Lmao Jungkook is jungshook in the thumbnail 😂😂💜

@40hzdrift22

3 жыл бұрын

I'm 20/400

@Ethane077

3 жыл бұрын

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 .

@paramjeetthakkar7088

3 жыл бұрын

@@Ethane077 how? How can we improve myopia

@SrJrXVIII

3 жыл бұрын

I can read the 10th letter stuffs in each eye but my right eye missed 1 letter

Wow I’ve learned so much this was a great video

I don't wanna be an eye doctor or test peoples visions or anything but I watched this whole video.

@dkcalgary

6 жыл бұрын

Hi, glad that you liked it! DK

@dkcalgary

5 жыл бұрын

Hi, wow, that is pretty keen! DK

@almanac520

4 жыл бұрын

Nice. Ophthalmic Technician is a great job, that is always short-staffed

A very good description. Thanks doc

Thank you! Thank you! Very detailed and informative information!

Very clear explanation, thanks!

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...

@armenianchik

2 жыл бұрын

That's exactly what I was trained to do as well.

Great video, thank you for posting!

This is the best informative video I've see!! Thank you so much.

@dkcalgary

Жыл бұрын

You are so welcome!

what if that person knows the sequence of this chart?

@dkcalgary

6 жыл бұрын

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

@dkcalgary

5 жыл бұрын

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

@almanac520

4 жыл бұрын

There are rondo mixed digital charts. Useful for some applications, but not as essential as you would think

@timothytiberia826

4 жыл бұрын

Have them repeat it backwards

@Win090949

4 жыл бұрын

dkcalgary S Q U I N T

LOL. The eraser. Haha. Watching this on panic mode because I've got PHYSIOLOGY practicals tomorrow huhuhu

Thank you. I needed to understand this better & you made it enjoyable to learn. Appreciate it. New subscriber. :)

you are a really good teacher, now I know how to do visual acuity.

@dkcalgary

2 жыл бұрын

Great! Thanks!

thank you!you made it clear for me..

@dkcalgary

6 жыл бұрын

Hi, thanks and Nice pun! DK

This was awesome. I am currently in Ophthalmic Tech School. Explained clearly!!

@dkcalgary

2 жыл бұрын

Wow! THIS is a prestigious endorsement- thanks!

@sweetbeep

Жыл бұрын

... 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! 😃

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.

@julianacheriza1575

4 жыл бұрын

I’m a medical assistant too!

i remember reading all those perfectly during my dads eye checkup and wanting to wear glasses.

@bitaniazelalem8946

3 жыл бұрын

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 🥲

Thank you..this was very helpful...and u really took your time to explain

@dkcalgary

6 жыл бұрын

Thanks! dk

@dkcalgary

5 жыл бұрын

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! Very refreshing and your efforts in making this video is truly appreciated.

@dkcalgary

6 жыл бұрын

HI, you are very welcome! DK

Thank you so much... Very informative..thank you for your time

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.

@dkcalgary

Жыл бұрын

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.

I say Zed and i am from the Caribbean. Hahaa. I enjoyed this video thoroughly. Thank you!

@dkcalgary

8 жыл бұрын

+Kay Will Go "Zed"!

@shaq7874

3 жыл бұрын

Im from carribbean too

@justbluemartin9346

3 жыл бұрын

I'm from Zambia and i say Zed too

Thank you. This was awesome

Very clear! Thank you!

Thank you ! very helpful

does Snell Chart have 6/5 vision letters in the last line

Thank you! Learnt something!

Thankyou doctor! Extremely helpful.

If I can't see the letter do I just say "I can't see it."? Am I allowed to squint?

@dkcalgary

7 жыл бұрын

People will squint, so you score what they can see. DK

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.

@jakeornot6306

Жыл бұрын

I think there is much lacking in the manner in which eye exams are conducted, a travesty in this, the 21st century.

you just saved my life. my practical is tomorrow!!

@dkcalgary

6 жыл бұрын

good luck! - dk

Loved this very useful because I started a job as a Medical assistant

@dkcalgary

5 жыл бұрын

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

I was so unsure what the meaning of the denominator was in the scoring system. Thank you so much for clearing this up!

@dkcalgary

Жыл бұрын

Happy to help!

Don't have a perfect eye sight? Well i suppose you can try to remember these words. ;)

@EasyGaming11

7 жыл бұрын

Its Rizl Lol if you have bad eyesight but good memory, you're good xD

@FidaAifiya

7 жыл бұрын

then you miss the whole point of this test

@MonkeyDLuffy-xr4fl

7 жыл бұрын

Well, I suppose you can enjoy further macular degeneration. ;)

@mehuhinhiisduniyaka6831

6 жыл бұрын

Its Rizl ok

@br0ke803

6 жыл бұрын

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!!

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?

@dkcalgary

3 жыл бұрын

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.

thanks doctor! im going to eye doctor in next few weeks :D thats helpful

@dkcalgary

3 жыл бұрын

Hi, this video just explains the process; it's great that you're going to get check out. DK

@desirod_15

3 жыл бұрын

im goining today-

@meandmyfriend7762

3 жыл бұрын

@@desirod_15 rip

@meandmyfriend7762

3 жыл бұрын

@@desirod_15 ive done it,got 7/10

@desirod_15

3 жыл бұрын

@@meandmyfriend7762 I got a 200- but my glasses come in soon and i cant wait :D

After 6 yrs ago I still come back to this video . Because dr explain so well /:)

@dkcalgary

2 жыл бұрын

Wow Arianni! Thanks very much!

This was helpful. I think I might be nearsighted so yeah. Thanks

I thought that big E was a dragon from 20 foot.....damn :/

@melindago6576

4 жыл бұрын

lol your comment made me laugh :)

@dkcalgary

4 жыл бұрын

:) I think you should drop by your health professional to get tested, though. Take care, DK

@desirod_15

3 жыл бұрын

sometimes it looks like a D

@drakesayshi3321

3 жыл бұрын

Last time I tested it actually, I could only read the second one

@rodneykuhn7025

2 жыл бұрын

@@drakesayshi3321 I almost cant read the top E. The eye doctor was like, holy shit.

My video quality was 140p and I thought I had a problem at first

Very informative. I always wondered how this worked.

@dkcalgary

4 жыл бұрын

I'm delighted to be of service! Thanks, David

Thank you for this. Highly appreciated

what does it mean 4.50? is it realy bad?

thank you, I learn a lot. love to see more videos

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

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😟😢

@dkcalgary

3 жыл бұрын

Hi, I think you should get checked by an eye health professional. Take care and best wishes.

What if the patient have those letter sequence memorized?

@dkcalgary

4 жыл бұрын

That can happen. Anytime I suspect it, I get them to do things like, "can you read line 3 backwards for me". DK

Finally, I get it. Thank you, sir!!!

very helpful!!! thank you so much

@dkcalgary

6 жыл бұрын

You're welcome! dk

Today I got my eyes tested and my power increased again In my left eye its -4.75 and in right eye its -4.25, but I am facing some kind of problem like I am feeling a little pain in my eyes, but when I close my eyes then it's gone Is it because of different powers in eyes or increased power or is it something else

@dkcalgary

2 жыл бұрын

You should follow up with your optometrist. Perhaps the prescription is too strong. Take care

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?

@masseffect4731

4 жыл бұрын

legally blind seriousley.

@otiebrown9999

4 жыл бұрын

Worse than 20/250

Great video, thank you

perfectly well explained!!! love it

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)

@yslslime3454

3 жыл бұрын

how

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.

@dkcalgary

2 жыл бұрын

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

@oldblackstock2499

2 жыл бұрын

@@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.

@dkcalgary

2 жыл бұрын

I'm sorry to hear this, but pleased that it sounds like you have good professionals taking good care of you.

@Gamer1234brendan

Жыл бұрын

My left eye im pretty sure with eyeglasses is 20/20 but my right may be 20/30

@Gamer1234brendan

Жыл бұрын

I don’t think 20/30 I bad but it best to read below the red line

Great video, thank you so much!

@dkcalgary

3 жыл бұрын

You're very welcome! Take care

Damn it. what an explanation sir❤

my eyes been bad all my life i cant ever remember having this test done

My visual acuity is 240p.

THANK YOU DOCTOR

Thank you for simplifying this

@dkcalgary

3 жыл бұрын

You are most welcome

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.

@mastertrey4683

7 жыл бұрын

Resolute Films hes american, hes just a damn hippie

@mastertrey4683

7 жыл бұрын

American or canadian. Sounds like he has a bitof accent

@ofunnemordi

7 жыл бұрын

TWrecks He's Canadian... I think...

@NevaehBeatez

7 жыл бұрын

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

@dkcalgary

7 жыл бұрын

Hi, now I know where Zed comes from. Awesome! thanks, DK

I think I have nearsighted vision but only in my right eye. My right eye can only see things within five feet.

Great video, Thank you for sharing

Great video. Thank you. One question. If they have an eye injury which eye do you start the exam with?

@dkcalgary

2 жыл бұрын

Clever question! I usually start with the injured eye as they are less likely to see well with it. Starting with the "good" eye increases chance of someone remembering letters for when testing the injured eye.

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.

@dkcalgary

6 жыл бұрын

HI, make sure you get checked out. DK

@urbestayy8196

3 жыл бұрын

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

@keana8060

3 жыл бұрын

Same I get bad headaches and eye aches plus I can’t see at night

@skhafijurrahaman9204

3 жыл бұрын

Same in my right eye.

@paulallen2680

3 жыл бұрын

My right eye is near sighted and my left is far sighted

20 ft?

@woke657

3 жыл бұрын

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)

@kynu3287

3 жыл бұрын

@@woke657 how many steps for that

@ethanzhao482

2 жыл бұрын

@@woke657 yes but the chart would have been a lot bigger in person

Thanks for the video!

Thx doctor for your aid we really do pre your help

I couldnt read the top one. My eye doctor was like, Seriously? LOL

@somerandomguyonlineforsome7870

3 жыл бұрын

Lmao blind fuck

@rodneykuhn249

3 жыл бұрын

@@somerandomguyonlineforsome7870 Yeah you got that right LMAO

@rodneykuhn249

3 жыл бұрын

Indiana made it illegal for me to drive without corrective glasses LOL

@somerandomguyonlineforsome7870

3 жыл бұрын

@@rodneykuhn249 imaginé

@rodneykuhn249

3 жыл бұрын

@@somerandomguyonlineforsome7870 Here in Indiana, theyd charge me with Impaired Driving. LoL