LoveBug
|
someone who has clear and perfect vision in both eyes |
|
a.chill
|
when you can see 20 things on the left and 20 on the right |
|
Summer
|
you have perfect vision, you can see well far and near (: |
|
Alex G
 |
you got perfect eye vision |
|
Milan S
 |
perfect vision |
|
Shellly P
|
you have really good vision,
think of it like a test, 20/20 = 100% :D |
|
hmfashion15
|
you can see 20ft perfectly
higher the # means you have less than good vision, and the lower the # the better. |
|
zorro_foxygirl
|
average vision that you see without having glasses or contacts |
|
Judy B
 |
It means you can see the "20" size letters when standing 20 ft away from the eye chart.
This is the average vision that a eye without disease or damage can see. Some such eyes can see a little better, some a little worse, so 20/20 is average. |
|
joshluver42
|
it means you see perfectly without contacts or glasses |
|
Tamahome
 |
Clear eyesight. No need for glasses. |
|
Colin
|
the best kind of vision |
|
California Gurl! :)
|
perfect vision |
|
The Mrs.
 |
20/20 to be more specific is:
"Visual acuity (VA) is acuteness or clearness of vision, especially form vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain.[1]
VA is a quantitative measure of the ability to identify black symbols on a white background at a standardized distance as the size of the symbols is varied. It is the most common clinical measurement of visual function. In the term "20/20 vision" the numerator refers to the distance in feet from which a person can reliably distinguish a pair of objects. The denominator is the distance from which a person with standard VA would be able to distinguish them—the distance at which their separation angle is 1 arc minute. The metric equivalent is 6/6 vision where the distance is 6 meters. Twenty feet is essentially infinity from an optical perspective (the difference in optical power required to focus at 20 feet versus infinity is only 0.164 diopters). For that reason, 20/20 vision can be considered nominal performance for human distance vision; 20/40 vision can be considered half that acuity for distance vision and 20/10 vision would be twice normal acuity. The 20/x number does not directly relate to the eyeglass prescription required to correct vision; rather an eye exam seeks to find the prescription that will provide 20/20 vision." |
|
mimi
|
it means you have perfect vision in both eyes, both of your eyes are focused the exact same :-) |
|
bradhurt2003
 |
it is perfect vision. it means that you see objects clearly at a distance of 20 feet that a normal person sees at a distance of 20 feet. |
|
[email protected]
|
By looking at lots of people, eye doctors have decided what a "normal" human being should be able to see when standing 20 feet away from an eye chart. If you have 20/20 vision, it means that when you stand 20 feet away from the chart you can see what the "normal" human being can see. (In metric, the standard is 6 meters and it's called 6/6 vision). In other words, your vision is "normal" -- most people can see what you see at 20 feet. (From here on, please assume that the word "normal" has quotes around it).
If 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.
You can also have vision that is better than the norm. A person with 20/10 vision can see at 20 feet what a normal person can see when standing 10 feet away from the chart. |
|
GingerinLV
|
Sorry if this is long, but I'm going to elaborate a little more on this question. Most people know the term "20/20 vision" but may not have a clue as to what it exactly means. So here it goes....bare with me, lol:
20/20 is a term used to express normal visual acuity (shapness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance. If you have 20/100 vision, it means that you must be as close as 20 feet to see what a person with normal vision can see at 100 feet away. 20/20 vision does not mean "perfect" vision. It only indicates the clarity of vision at a distance. There are many other important factors that contribute to your overall vision ability: peripheral vision, depth perception, color vision, eye coordination, focusing ability, etc... |
|
| |
|
Health
Forum 
Optical 
No Spam
Adult 
Gambling
Unfinished
Deception
Plagiarism
Not English
Large Text