Patent ID: 6607521
Filing Date: 2003-08-19
Classification: A61F

Abstract:
An apparatus for corneal surgery to correct a refractive error by ablating an optical zone of a cornea with a laser beam, the apparatus comprising:input means for inputting a first amount of astigmatic correction and a second amount of astigmatic correction obtained by dividing a total amount of astigmatic correction into two approximately equal amounts in any case of correction for simple myopic astigmatism and correction for mixed astigmatism; myopic astigmatism correction means for ablating the cornea more amount as it is closer to a flattest meridian of astigmatism and less amount as it is farther from the flattest meridian based on the first amount of astigmatic correction; and hyperoptic astigmatism correction means for ablating the cornea less amount as it is closer to a steepest meridian of astigmatism and more amount as it is farther from the steepest meridian based on the second amount of astigmatic correction.