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Visual Acuity Test

Amsler Eye test for central vision :: Ishihara test for color Blindness
                                  Visual Acuity test

Visual acuity measures our ability to see small detailed black objects on a white
background, such as printed text.

What does 20/20 or 6/6 mean?

20/20 and 6/6 (6/6 is the metric measure) only indicate how sharp or clear your
vision is at a distance. Overall vision also includes peripheral awareness or side
vision, eye coordination, depth perception, focusing ability and color vision.

20/20 or 6/6 vision describes normal visual clarity or sharpness measured at a
distance of 20 feet, or 6 meters, from an object. If you have 6/6 vision, you can
see clearly at 6 meters what should normally be seen at that distance. If you have
6/30 (20/100) vision, it means that you must be as close as 6 meters (20 feet) to
see what a person with normal vision can see at 30 metres(100 feet)

Why do some people have less than 20/20 or 6/6 vision?

The ability to see objects clearly is affected by many factors. Eye conditions like
nearsightedness, farsightedness or astigmatism or eye diseases influence visual
acuity.

Coming soon is an interactive online visual acuity test.

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:: Ishihara test for Color Blindness

Color blindness is an inaccurate term for a lack of perceptual sensitivity to certain
colors. Absolute color blindness is almost unknown. There are three types of color
receptors in our eyes, red, green and blue. We also have black and white receptors.
They are more sensitive than the color receptors, that is why we have poor color
perception in the dark.

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