Optical refraction correction methods

Details Optical refraction correction methods Optical refraction correction methods

A - Human Necessities

61

F

A61F 9/007 (2006.01) A61F 9/01 (2006.01)

Patent

CA 2189914

Laser energy is used to remove all the epithelium from a defined treatment zone on the surface of the cornea by focusing a laser beam on the epithelium and monitoring the vapor produced by ablation of the epithelium. The stroma is then sculpted to provide the desired refractive correction by dividing the ablation zone into a set of sub-zones and applying laser energy to each sub-zone in sufficient intensity for predetermined times to remove and reshape the surface of the stroma.

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