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20/20 Vision
20/20 vision is a term used to express normal visual acuity (the clarity or
sharpness of vision) measured at a distance of 20 feet. If you have 20/20
vision, you can see clearly at 20 feet what should normally be seen at that
distance. If you have 20/100 vision, it means that you must be as close as 20
feet to see what a person with normal vision can see at 100 feet.
20/20 does not necessarily mean perfect vision. 20/20 vision only indicates
the sharpness or clarity of vision at a distance. There are other important
vision skills, including peripheral awareness or side vision, eye coordination, depth perception, focusing
ability and color vision that contribute
to your overall visual ability.
Some people can see well at a distance, but are unable to bring nearer
objects into focus. This condition can be caused by hyperopia (farsightedness) or presbyopia (loss of focusing ability). Others can
see items that are close, but cannot see those far away. This condition may be
caused by myopia (nearsightedness).
A comprehensive eye examination by a doctor of optometry can diagnose those
causes, if any, that are affecting your ability to see well. In most cases, your
optometrist can prescribe glasses, contact
lenses or a vision therapy program that will help improve your vision. If
the reduced vision is due to an eye disease, the use of ocular medication or
other treatment may be used.
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