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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.
Acuity is tested with vision charts of letters or images. Changes in luminous intensity are perceived as flicker, and the difference in luminous intensity from one object to another is perceived as contrast [1]. The visual field encompasses the entire region of space seen while gaze is directed at any central object. This tutorial explains visual field testing.