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Soft & rigid lenses can have very light tints
to improve their visibility when off the eye & to add the patient
in handling them.
Soft & rigid lenses that alter the apparent eye
color are available in cosmetic enhancement tints for people who
have lighter eye & opaque tints for people who have darker eyes.
Such lenses typically have a clear central area of
about 4mm for visual purposes & a clear annular peripheral area
of about 1mm which overlays the sclera.
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