Surgery – Instruments – Light application
Patent
1994-02-10
1996-04-09
Shay, David M.
Surgery
Instruments
Light application
606 3, 606 10, 606 13, A61N 506
Patent
active
055057233
ABSTRACT:
Methods and apparatus as disclosed for shaping the cornea of a patient's eye such that the epithelial tissue of the patient's cornea is shaped into a preliminary shape, corresponding to a desired final stromal shape, using photoablative radiation, and then the preliminary shape of the epithelial tissue is transferred into the stromal tissue of the cornea using photoablative radiation, thereby shaping the cornea into the desired final stromal shape. The epithelium may be shaped using an erodible mask with a predefined profile of resistance to erosion, or by a graded intensity filter, or by selectively varying the dimension of an aperture that controls the area of the epithelial surface irradiated by the photoablative laser radiation or by other mechanisms that selectively expose regions of the epithelium, or by a scanning laser beam. The epithelium may also be shaped, without using an aperture or a mask, by using a beam of photoablative radiation with substantially uniform intensity distribution.
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Engellenner Thomas J.
Shay David M.
Silveri Jean M.
Summit Technology Inc.
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