as a person that has had glasses since 10 years old (now almost 40), i find interpreting the numbers as relative distances easiest. without correction, i have ~20/400 vision. i think of this as "what a person with normal vision can read at 400 ft, i must be 20 ft away to read with the same acuity." feet (or meters) has a meaning to me that i already understand and can conceptualize. treating the second number as a text size takes that meaning away, and it becomes arbitrary. that's me, anyway.

SO good! Always wondered. You are a great teacher. Thank you!

Under rated channel! Support from NZ! Love the content

That was a great explanation! Thank you! :)

Super interesting You are the smartest doctor Thanks for your information that help me a lot

One time in an anatomy class we did an activity determining vision. No one in my group wore glasses, I have ones I wear when I need em. They were verry suprised at “how I couldn’t read that from that far” XD it was pretty funny, I guess none of them really thought about how people with glasses can have such worse vision. Mine isn’t even that bad XD

Ive had astigmatism since I was 17 and my first optometrist told me that in 10 years that by wearing my glasses my vision would be alright and will be back to normal. As if I didnt have astigmatism EVER Haha Im 32 now. Its still the same. Please discuss this. If its true or not.... Thank you Im so glad your chanell exists Props to you in informing us all more about our eyes Its fascinating

I’m from the Uk and we have advertisements about laser eye surgery that say you can achieve ‘20/20 vision or better’. I’ve never heard of 6/6

Hey, i saw your videos about Myopia and Astigmatism and i think they are very helpful to people that are curious on how people with those problems see the world, but i'm wondering if you could do a video talking about how people that have both these problems see, because i had to do a surgery on both my eyes when i was just 1 year old, if i didn't do the surgery i would probably be blind, and the surgery removed my Crystalline (i hope that is the name of the thing), making me have something like 18+ on both Myopia and Astigmatism, nowadays it has lowered to 14-ish on both but without my glasses i can only recognize things that are close and big but can't see too much in detail.

Hey Antonio, I would love to see a video showcasing how diplopia may look, so that my friends can better understand what i'm trying to explain.

Thanks Antonio, can you do a video on LIRIC (Laser Induced Refractive Index Change)? It's a new refractive surgery method still in development (the big drawcard being its non-ablative nature), but it would be good to hear your preliminary thoughts on it.

Thank you Sir for your comprehensive information, for accuracy a small correction, as an architect per my calculation the height of 5 minutes arc at the distance of 20 feet is 8.866 mm ~ 8.9mm 🙏

as a german optometrist the term "20/20 vision" continued to elude me to this day. thank you for explaining :D

I can read long and short distances but I get headaches with short distances. The glasses get rid of the headaches most of the time. My vision is not really blurry when reading. I am also on the spectrum, so sometimes what I am reading doesn't click with my brain or I read something wrong. I am in Australia in NSW

I think in Germany we give the number as percentage. So 100% vision, 200% vision, 50% vision and so on.

Hi Antonio, I'm really grateful for your videos and I've learned so much from you! I am thinking about surgical vision correction with ICL. Could you please refer to this? I wonder how often side effects occur and whether they disappear over time. I know this method is reversible, but does that mean the side effects are reversible too? Finally, what is your personal opinion, would you opt for such surgery? I will be really happy to hear your minds as an optometrist, great thanks!

20/20 is not perfect. But it is pretty damn good!

THANK YOU FOR THIS INFORMATION

Hi Antonio. I like your videos they are informatively. I wonder if you could explain in a video if you can and want to, ( i have dubble vision in one eye and i see fine if i put a finger in half the viewing field horizontally ) and another thing (my overall vision is blurry and pendulate from one day to day after, and i see fine again. I think its my tearfluid thats are the main problem, I am going to the lokal optician to se about that.) Have a nice life.

I would greatly appreciate a video on visual snow!! Pls lol

Most of your vision is concentrated in the center of your vision though. I've heard that it's like 7MP in the center, and 1MP for everything else. Question, do we ever correct for higher order distortions than cylindrical? I know we correct for spherical aberration, and for cylindrical (astigmatism) -- But I wonder if we correct for other distortions, and how. Is it possible to have diffraction limited vision? What would this vision be? Is it possible to get a point spread plot of our vision?

Love to see some videos about strabismus. Its so complex with dubbel vision and strange eye movements.

For iPhone users, which is better for the eyes to use? Is it light mode or dark mode especially if you have myopia? I hope you’ll reply please.

Hello Antonio can you show us how to cut and make eyeglasses.?

Hello dr.! I just learned recently that my 11 yr old child has myopia we went to the eye doctor and -2.25 was the result of the eye test he could see clearly when reading but blurry when looking in a distant.he is mostly at home doing online class so does she need to wear glasses all the time or as needed like when she goes out of the house only?

I'm fortunate enough to have 20/7 VA. Exceeding 20/10, has less to do with the optics and more to do with the amount of cone receptors in the retina. For a reference to what this looks like...I am able to see the tiny reflective diamond patterns on road signs when I drive.

thank you.

Hello anthonio!...so if I can't see the 20/20 letters due to myopia on the snellen chart then I need -1.0 correction lenses?

Can you please make a video on the cornea. My cornea is too thin to have laser eye surgery and I was wondering if it can be corrected to its usual thickness. It is the main barrier for me to have laser. I am desperate to have 20/20 version! Much appreciated.

Without glasses, the list of letters on the screen in invisible. I see a few grey lines.

My doctor told me that my right eye was 20/13 and my left was 20/15. I was so confused lol. But it's been about 2-3 years so I'm scared to get tested again and find out it's not as good

thank you

Would getting a presciption to make your vision more like 20/10 when you have 20/20 vision be bad? Of course it would be unecessary but would that work?

Here in the Philippines we use "20/20 vision"

Hello! Unrelated topic, about something I experienced. I was deep in VR for almost entire days a few days in a row. I know it's not recommended, but I didn't feel anything was wrong. Until I stopped my VR spree and I found out that it is harder for me to accommodate at objects at different distances in real life. The effect went away after 2 days or so. I felt like I need to make conscious effort to do the accomodation. I think it is because of the fact that accomodation in VR is not present at all, the entirety of the 3D effect is from stereoscopic effect and accomodation is basically off. It's just my hypothesis though. Do you know if this subject has been studied? If not, maybe given the rise of VR, it would be worth it to study it?

My last vision test and prescription didn't use 20/20 (in the US), but my prescription says things like DIST R SPH -1.75 CYL -1.25 AXIS 105. Could you please do a video that explains these terms? I know I'm exceptionally nearsighted so much that I cannot drive even corrected but I'd love to know the details. Thanks!!

I was always curious what that 20/20 is, all people from English speaking countries are using that, but here in Europe, we have no idea what does it mean. 😀

I have a question cause I’ve been having a not so great year but for about two months I read on my phone in bad lighting and my nearsightedness has returned the last time I wore glasses was when I was 6 for a couple months but afterwards my vision went back to normal 20/20 but I just turned 20 last month and I was wondering is it possible for my vision to go back to normal if I better my diet and take herbs also my prescription is -1.50

Can you explain why one eye is near sight and the other far sight please?

Can you do a video on a nystagmus

Who uses LogMAR? why is it used?

Since 1 feet is 304.8 mm then the letters would be 20*304.8 mm * tan (1/12 °) ~ 8.866 mm ~ 8.9 mm in size (~ 0.35 inches)

Can you please suggest medicine to recover from retina damage due to artery occlusion.

im legally blind in left eye i have 20/630 vision😢 but i have 20/25 vision in right eye.😅 so i might not considered as legally blind.

honestly all those numbers on the far right didn’t really make sense to me that claim to determine our vision status

I have a questionn, if seeing more blurry at night could it be real myopia because pseudomyopia see clearer when pupil dilate? Or i misunderstanding something.

so ur saying its best i keep my comp screen 6ft at best since it is the resting focal length for less eye strain and contraction?

Hi Antonio, is it true Lionel Messi has 50/50 vision?

20/13...20/5 in one eye and 20/10 in the other eye.❤

What about 20/1 vision? Is it possible?

In Greece we say 20/20

Hey Ik this is random but how wide do humans see on each eye ?

I tested as 20/10 however I think my brain was able to decipher small letter's from memory

I have 6/6 vision......can it get worse due to phone usage??

I have a question. I am near sided and can see very well up close but very poor far away. If I put my face up to a computer screen or book, I can see everything. Now when I put on a vr headset, the screen is basically an inch from my eyes yet to see in the distance when gaming in VR i need my glasses or contacts just like in real life to see far away and then I can see again. With the screen is so close to my face, shouldnt my near sided vision see the entire screen clear? how does this work?

Can 6/6 vision get worsen?? Due to any reason

Technically not an eye disorder, but have you heard about visual snow?

As someone with 4.75 and 5 diopters nearsightedness prescription, from what ive read online im "legally blind" For reference after a quick Google search that is anywhere from 20/300 to 20/500, if the sources are correct. Im considering lasik surgery, but ive not yet made up my mind

So doing better than 20/20 vision is true afterall. I assumed the eye doctors were kinda being funny. But this makes sense now

I used to have 20/15 vision as a kid

I fail this test when I was elementary 😅

Antonio, I have 6/10 vision with glasses, is that good vision or not?

no, I don't have 20/20 vision, I'm near sighted... hahaha at least I have a good resolution to see near objects...

Anybody Could help me figure out what happening with my eyes(-4 with contactlense)?Just a example: When I look at white wall and on the wall hanging a picture or a connector plug and focusing on it for few second and after looking next to it,then I see a bright white spot which shape exactly like the object I was looking at. Often when I looking at something for few sec and move my eyes a side a bit, I see the same shape just bright like when you was looking in the sun.Few sec and is disappear. In our house have a pile to hold the ceiling is same white as the wall. When I look at it for 5 second and after look at wall then I see the pile but in this time is gray as shadow. A few second and is disappear.

Any glasses frame brands that are made of a high percentage of plant based plastic/ acetate? I am allergic to metals and usual plastic frames

I'd really like to know at what "Hz" or FPS a human eye operates at?

At 44 years old I’ve got 20/10 in my right eye and 20/15 in the left with mild glasses. When I was still in my mid 30s I still had 20/10 in both. Every time I see new optometrist or ophthalmologist they never believe it, some don’t even want to test me beyond 20/20, which gets frustrating. I get it’s rare but it happens. It’s quite useful, however! Edit: yes, I’m willing to prove it.

I'd rather die than use the metric system (just kidding)