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The standard definition of normal visual acuity is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc. Consider a circle which contains 360 degrees. One degree contains 60 minutes. Therefore, a visual angle of one minute of arc is 1/60 of a degree.f you require glasses because your optometrist says you have 20/60 vision, that means you are able to discriminate characters on an eye chart at 20 feet that a person with normal acuity can see at a distance of 60 feet. 6/6 means the same thing only in meters.
Visual acuity is a measure of how well you can see. One of the most important components of an eye exam, a visual acuity test will help your eye doctor determine whether or not you need vision correction. Visual acuity testing is no substitute for a comprehensive eye examination. However, it is one of the most important measurements one can perform when evaluating the human visual system. Visual acuity can be tested at a distance as well as up close.