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Sight
the sense through which a person or animal becomes aware of light, color, etc., by using the eyes
Vision
the procedure of taking in, processing, and integrating visual and other sensory information to form a perception
Acuity
the resolving power of the eye to see small detail at the distance tested
20/40 vision means you must stand 20 feet away to see what a person with normal vision can see from 40 feet away.
normal = 20/20
driving = 20/40
What is normal acuity? What acuity is required to drive with an unrestricted license?