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00132_Field_132.txt
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1997-10-28
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733b
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ANATOMATICAL CONSIDERATIONS IN LENS CHOICE
Sometimes the patients ocular anatomy dictates the lens choice.
If the patient has a distorted cornea
the only lens type that may give
acceptable vision is a rigid lens.
Since the rigid lens masks the
distortion by allowing the tear layer
to neutralize it, the front of the lens
becomes the new, regular front
refracting surface of the eye.
A hydrogel lens will conform to the
irregular surface with no significant
tear layer to neutralize the
distortion, therefore, the vision is
not significantly improved.
Patients with corneal distortion from
trauma, disease, surgery, keratoconus
or other causes usually are best fit with rigid lenses.