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Answered 2011-04-29 15:47:59

A person with 20/20 vision can read an eye chart at a distance of 20 feet. A person with 20/40 vision can't and has to get closer to the eye chart. A person with 20/20 vision can read at 40 feet what a person with 20/40 vision

AnswerIf you have 20/40 vision, it means that when you stand 20 feet away from the chart you can see what a normal human can see when standing 40 feet from the chart. That is, if there is a normal person standing 40 feet away from the chart and you are standing only 20 feet away from it, you and the normal person can see the same detail. 20/100 means that when you stand 20 feet from the chart you can see what a normal person standing 100 feet away can see. 20/200 is the cutoff for legal blindness in the United States.
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It means seeing at 20 feet what a person with normal vision sees at 20 feet. A person who has 20/40 vision can see at 20 feet what the person with normal vision sees at 40 feet, etc. Some people have better than 20/20 vision.


There is no vision score of 40/40. Vision is scored on the distance a person can see in feet. A vision score of 20/20 would be considered perfect sight.


Do you mean for eyesight?20-20 vision is average vision of human what he can see normally from 20 feet away as a standard.If 20-40 vision, that means you have to stand 20 feet away from an object that the average person can distinguish from 40 feet away.If 20-15, that means you can stand 20 feet away from an object that the average person can distinguish from 15 feet away.


Do You mean 20-20 vision?


I am pretty sure that is very bad for u, I have 20-40 vision


20/20 vision is when you can see things without difficulty from 20 feet away. It's average vision.


Yes I have 20 40 vision and I am getting glasses


Technically, it is NOT considered perfect vision. 20/20 is considered nominal vision and is a value that represents an accepted level of visual acuity for a human. It means that at 20 feet, you can see things the average person will see at that distance. Good vision would mean the the bottom number is smaller, you can see at 20 feet what most people can see at 15 or 10. 20/40 would mean that you have to be at 20 feet to see what a normal person sees at 40 feet. Most places define blindness as 20/200.


It is a form of visual acuity. You see at 20 feet what normal vision would see at 40 feet. You are near sighted.


No!!! 20 / 40 vision is better than 20/20. 20/20 is average vision what a normal person can see, anybody below that e.g 20/10 has worse vision than an average person they see what a normal person would see at 10 ft away rather than a average person at 20 ft away! People with 20/40 vision can see what an average person sees at 20 ft away in the same detail but 40 ft away! so no 20/40 vision is a good thing and way better than being average. (i have 20/40 vision, according to my optician!! wooooxxx)DO NOT LISTEN TO THE PERSON ABOVE ME!!!!They've got it backwards. If you have 20/40 vision, that means you can see what the average person sees at 40 feet from a distance of 20 feet. In other words, 20/20 vision is twice as good as 20/40 vision. Plus, if this was true, then imagine the person who has 20/200 vision (which is a real vision). If it were that way, then there'd be people that could see as well as a hawk, which is ridiculous. The lower the second number, the better the vision.WRONG!!!!!!!!!!!!!!! DRS HAVE TOLD ME THAT IT IS NOG GOOD BUT NOT BAD SO SCREW U LYRVisual acuity - As part of the testing, you'll be asked to read letters on a distance chart. This test measures visual acuity, which is written as a fraction such as 20/40. The top number is the standard distance at which testing is done, twenty feet. The bottom number is the smallest letter size you were able to read. A person with 20/40 visual acuity would have to get within 20 feet of a letter that should be seen at forty feet in order to see it clearly. Normal distance visual acuity is 20/20.http://www.aoa.org/Astigmatism.xml



Normal vision is 20/20 vision, or in metric 6/6. This means that when you are 20 feet away from something, you will see what someone with normal vision would see at 20 feet away. With 20/40 vision, you would see something 20 feet away as someone with normal vision would see it at 40 feet, so therefore it would be blurry. 20/100 is also possible and 20/200 is considered legal blindness. 20/10 would be better than normal. (Adapted from howstuffworks.com)


It means that when you look at something 20 feet away, you see it with the clarity that someone with good sight would see 40 feet away.It means you need glasses.


that means that you have perfect vision__________________________________________________________The numerator refers to within what distance of certain objects you have to be to distinguish them. The denominator refers to within what distance of certain objects a "normal" person has to be to distinguish them. Therefore, 25/25 vision is much like 20/20 vision in that it indicates normal/perfect vision. If the numerator is greater than the denominator (20/15), one's vision is better than normal. If the denominator is greater than the denominator (20/40), one's vision is worse than normal.


It means that u can see at 10 ft what an average person sees at 20 feet. and the average vision is 20 20



20/100 Vision would mean that the average person can see clearly at 100 feet you must be 20 feet away to see the object clearly.



It means you don't see as well as people with 20 20vision, I would think. --*Actually it means you see BETTER at a distance than someone with 20/20 (normal) vision. 20/10 vision means that you see at 20 feet away what most people with normal 20/20 vision need to be 10 feet away in order see clearly


It means that a person needs to be within 20 feet to clearly see what someone with "normal" (20/20) perfect vision can clearly see at 25 feet. It's good but not perfect vision


hmmmm...it's usually 10/20 if you have "half". I would say so.


I guess you mean: What number when you subtract 20, gives 40 as the answer?x - 20 = 40.Add 20 to both sides: x - 20 + 20 = 40 + 20x = 60


You need some glasses fam


Yes, 20 15 vision is better than 20 20 vision.


It means you have pretty close to perfect vision as 20/20 is considered perfect. Simply put, most people see at 25 feet what you see at 20.



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