Corneal heat and stretch method and apparatus
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United States of America Patent
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Feb 15, 2000
Grant Date -
N/A
app pub date -
Apr 10, 1998
filing date -
Apr 10, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus to alter the shape of the cornea of an eye provides for heating a portion of the cornea to a temperature not exceeding the collagen shrinkage temperature, and applying a pressure differential to a portion of the cornea. The combined effect of elevated temperature and stretching forces leads to permanent residual strains in preferred directions, and thus to a permanent new shape of the cornea. The method is applicable to the correction or reduction of myopia, hyperopia, and astigmatism.
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