A person has presbyopia when his/her
natural lens is unable to adjust its focus or
accommodate for close vision tasks. This
condition is usually associated with the
normal aging process. The result is that the
light entering the eye in a normal fashion is
focused behind the retina by the eye's
optical system.
Corrective measures involve placing a lens
(spectacle or contact) in front of the eye,
usually in the form of reading glasses,
bifocal lenses, or multi-focal progressive
lenses. These lenses cause light to bend or
converge, forming an in-focus image onto
the retina.
The corrective lens causes the light from the more divergent near image to converge and focus more directly onto the retina.
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