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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.
Near Vision Testing. There are many charts for assessing near acuity. The metric, or M system is a linear scale of reading visual acuities, unlike the Jaeger or point notation, and is easily tested and recorded at any distance. 1 M letters are 1.45 mm tall and are roughly equivalent to magazine print.