What is vision 20/20?

Question

What is vision 20/20?

Answer 1

It is not the year Malaysia hoped to achieve industrial country status .... but if you are referring to our eyes vision, check out the below: -

http://en.wikipedia.org/wiki/Visual_acui...

Answer 2

wawasan 2020

Answer 3

perfect eye vision...

Answer 4

The year i lead a group of nationalist to topple the government and become the youngest Prime Minister of Malaysia and announce to the world that Malaysia is planning to develop nuclear and biological weapon to destroy each ugly human being ... muahaha!

*vote for parti ikan!

Answer 5

Perfect vision (in optometry)

Answer 6

production house (mainly produce Chinese film & drama)

Answer 7

It is the ability of a person to see an object (normally tested in letters) at 20 feet that the "standard' person can see in 20 feet. However, most emmetropic (normal sighted) people see at about 15/20 or 10/20, although there are some reports of people having up to 8/20 (lucky!)

It is tested by using the snellen chart ( http://en.wikipedia.org/wiki/Snellen_cha... ).

It is usually placed at a distance of 20 feet from the person, although that varies.

Interesting fact: in my country we say 6/6, because apperantly 6 meters=20 feet.

Here is part of the snellen chart wikipedia article:

"Snellen defined “standard vision” as the ability to recognize one of his optotypes when it subtended 5 minutes of arc. Thus the optotype can only be recognized if the person viewing it can discriminate a spatial pattern separated by a visual angle of 1 minute of arc.

In the most familiar acuity test, a Snellen chart is placed at a standard distance, twenty feet in the US. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 20/20, is the smallest line that a person with normal acuity can read at a distance of twenty feet.

Three lines above, the letters have twice the dimensions of those on the 20/20 line. The chart is at a distance of twenty feet, but a person with normal acuity could be expected to read these letters at a distance of forty feet. This line is designated by the ratio 20/40. If this is the smallest line a person can read, the person's acuity is "20/40," meaning, in a very rough kind of way, that this person needs to approach to a distance of twenty feet to read letters that a person with normal acuity could read at forty feet. In an even rougher way, this person could be said to have "half" the normal acuity.

Outside of the US, the standard chart distance is six meters, normal acuity is designated 6/6, and other acuities are expressed as ratios with a numerator of 6.

Acuity charts are used during many kinds of vision examinations, such as "refracting" the eye to determine the best eyeglass prescription. During such examinations, acuity ratios are never mentioned.

The biggest letter on an eye chart often represents an acuity of 20/200, the value that is considered "legally blind." Many people with refractive errors have the misconception that they have "bad vision" because they "can't even read the E at the top of the chart without my glasses." But in most situations where acuity ratios are mentioned, they refer to best corrected acuity. Many people with moderate myopia "cannot read the E" without glasses, but have no problem reading the 20/20 line or 20/15 line with glasses. A legally blind person is one who cannot read the E even with the best possible glasses."

For more information check out http://en.wikipedia.org/wiki/Visual_acui...

Answer 8

Do you mean 20/20 vision?It means having pefect sight, neither long- or short-sighted so without the need for glasses or contact lenses.