Multizone, multipass photorefractive keratectomy
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United States of America Patent
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May 18, 1999
Grant Date -
N/A
app pub date -
Jun 17, 1996
filing date -
Jun 19, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multizone, multipass photorefractive keratectomy (MP-PRK) technique to treat 315 eyes with the 193-nm VISX 20/20 excimer laser. The procedure includes making multipass ablations that increase in ablative depth to create as step-wise ablation of the corneal to the predetermined dioptric correction. It also includes making multizone ablations that create of variable widths that result in a predetermined ablative depth with smooth transition edges. A combination of multizone, multipass ablations are used to treat astigmatism. New algorithms effectively treat the full range of myopia, including low myopic eyes (-1 to -6 D), moderately myopic eyes (-6 to -10 D); and highly myopic eyes (-10 to -27 D).
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