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If a person has 20/20 visual acuity it means that when they stand 20 feet away from the chart they can see what a "normal" person can see at 20 feet. With 20/40 acuity, the person must move up to 20 feet to see what a "normal" person can see at 40 feet.
Visual acuity is just one part of vision. Other important vision parameters include: peripheral vision, depth perception, refractive error, focusing ability and eye health.
A person with excellent visual acuity may well have serious vision problems that interfere with daily activites. Indeed, a person with tunnel vision may have 20/20 acuity but be legally blind. Or a person with moderate hyperopia can have severe headaches and eyestrain while having 20/20 visual acuity.
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Children's Eye Health- Children often do not know how they should be seeing because they assume everyone sees the way they do. Because of this, the American Optometric Association recommends that all children receive a professional eye and vision examination at critical stages in their visual development. These stages are
By six months of age, At 3 years of age, Before first grade, At least every year between ages 6 and 18.
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