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00286_Field_286.txt
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1997-10-28
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533b
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20 lines
THINNNED ZONE STABILIZED TORIC LENSES
Hydrogel toric lenses may be prevented
from rotating by thinning the top and
bottom portion of the lens instead of
using prism. The thin portions of the
lens stay under the lid margins. If the
lens rotates such that the thin zones
are horizontal, when the patient blinks
the lid will hit the
thicker portion on
the side where the
lens has rotated up
and will push it back
down to keep the
lens aligned.
Thin zones can be
used in place of
prism.