Visual acuity

Visual acuity is the eye's ability to detect fine details and is the quantitative measure of the eye's ability to see an in-focus image at a certain distance. The standard definition of normal visual acuity (20/20, 6/6 or 0 vision) is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc.

Related Topics:
Eye - Visual angle - Minute of arc

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