What is 20/20 Vision?
From Twenty Feet Away Normality is defined as a clear perception of the designated “normal” line of letters at 20 feet from the eye chart.That is the first “20”. The second number, which may or may not be “20” is a comparison between the tested eye and a “normal” eye. The higher the second number is, the more vision impairment your eyes have. · If a normal eye can see from 40 feet away what you must stand only 20 feet away to see, your vision is described as “20/40”. · If a normal eye can see from 100 feet away what you can only see if you stand 20 feet away, your vision is “20/100”. · If your vision is described as “20/200”, you are legally blind. To describe this another way, imagine you moving back and forth from the eye chart, trying to see the “normal” line clearly. If you can see it clearly from 20 feet away, your eyesight is 20/20. If you must edge closer to the chart to see it, your vision is impaired and you are nearsighted. But ophthalmologists don’t usually measure those closer distances in defining your visual acuity. They talk in terms of further distances and postulate that the tested eye is always at 20 feet from the chart. They then compare that amount of acuity with what a normal eye has at varying distances.
When the normal eye can see from 80 feet what you see at 20 feet, your vision is 20/80. Vision Better Than “Normal” · If your vision is 20/16 you can see from 20 feet away what a “normal” eye can only see from 16 feet. That is better visual acuity than what we consider to be normal. After a Custom LASIK surgery many people can see with 20/16 clarity.
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03.05.2010
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