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Visual acuity

A 36-year-old member asked:
Dr. Jay Pepose
39 years experience Ophthalmology
: A test of visual acuity measures how many clock hours an object viewed at a given distance will subtend on your retina.
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Dr. Richard Bensinger
52 years experience Ophthalmology
Visual acuity: Acuity tests are standardized charts of various sized objects, usually letters or numbers, which delineate the limits of vision. This can be with or ... Read More

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A 43-year-old member asked:
Dr. Richard Bensinger
52 years experience Ophthalmology
Compare to normal: You can get a rough idea if you have 20/20 by comparing your sight with someone who has perfect vision (or perfect with correction). Both of you view ... Read More
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A 32-year-old member asked:
Dr. Richard Bensinger
52 years experience Ophthalmology
20/08: A number of younger people can see 20/15 and a few 20/10. I have not seen one at 20/08 but I have read about them. The highest acuity of all is in r ... Read More
A 42-year-old member asked:
Dr. Richard Bensinger
52 years experience Ophthalmology
Testing: You can get a rough idea if you have 20/20 by comparing your sight with someone who has perfect vision (or perfect with correction). Both of you view ... Read More
A 32-year-old member asked:
Dr. Richard Bensinger
52 years experience Ophthalmology
Raptors: The sharpest vision that we know of occurs in the raptor group of birds (eagles, hawks, falcons) who have four times better acuity than humans. Visua ... Read More
A 42-year-old member asked:
Dr. Faramarz Hidaji
29 years experience Cosmetic Surgery
Using both eyes: Combined visual acuity is the best that you can see with both eyes open. Though one would think that it can only be as good as the better seeing eye, ... Read More
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A 38-year-old member asked:
Dr. Alan Jackson
30 years experience Addiction Medicine
This is a metric: Measurement of vision. This would be a vision equivalent to 20/15 or better the 20/20.
A 28-year-old male asked:
Dr. Alan Mindlin
50 years experience Ophthalmology
Seeing: Visual acuity is simply how well a person sees, there are international standards.For comparison that transcend language and even metric versus engli ... Read More
A 34-year-old member asked:
Dr. Jay Pepose
39 years experience Ophthalmology
Yes: There are a number of on-line tests of near and distance acuity. For example, www.Preventblindness.Org/eye_tests/ is a good resource. There are also v ... Read More
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A 40-year-old member asked:
Dr. Ilan Cohen
25 years experience Ophthalmology
Ratio: The ratio is an indirect way of measuring how small of an object can be resolved independent of the distance at which it is viewed. For snellen fracti ... Read More

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