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Visual acuity - Wikipedia, the free encyclopedia GoogleBlogs position 1
In the term "20/20 vision", the numerator refers to the distance in feet between ... of vision” and defined it as the ratio between a subject's VA and a standard VA.

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

20/20 vision - definition of 20/20 vision - vision - About.com GoogleBlogs position 2
Jan 15, 2009 ... The smallest line you can read on a chart is your visual acuity. Perfect visual acuity is written as 20/20.

http://vision.about.com/od/eyeexaminations/g/acuity_test.htm

What does a measured eye sight of 20/20 vision, or 20/40, 40/20 ... GoogleBlogs position 3
As you can see, 20/20 vision is not perfect vision; it is average vision. Examples of better than ... By definition, 20/20 is AVERAGE. Answered by: ...

http://helpglobe.com/answers.aspx%3Fqid%3D315

The Eye Chart and 20/20 vision - AllAboutvision.com GoogleBlogs position 4
20/20 vision (or really, 20/20 visual acuity) is considered "normal" vision, meaning you can read at 20 feet a letter that most human beings should be able to read ...

http://www.allaboutvision.com/eye-test

How Visual Acuity Is Measured GoogleBlogs position 5
A Broken Wheel vision test is one that can be used for children or those who ... The Snellen fractions, 20/20, 20/30, etc., are measures of sharpness of sight. ... it also does not inform us as to whether or not meaning is obtained from visual input, ...

http://www.mdsupport.org/library/acuity.html

20/20 vision noun - definition in British English Dictionary ... GoogleBlogs position 6
20/20 vision noun - definition, audio pronunciation, synonyms and more for 20/20 vision noun: the ability to see perfectly, without needing to wear glasses or ...

http://dictionary.cambridge.org/dictionary/british/20-20-vision

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