Corneal surgery apparatus

A corneal surgery apparatus for ablating a cornea of an eye to be operated with a laser beam comprising:

• ablation means having an irradiation optical system, for ablating the cornea by irradiation of the laser beam;
• ablation amount computing means for obtaining a total
• ablation amount of the cornea based on a refractive error of the eye and for obtaining a first ablation amount based on the total ablation amount and a predetermined ratio;
• determining means for determining first control data for first ablation by the ablation means based on the first ablation amount;
• control means for controlling the first ablation based on the first control data;
• corneal shape measurement means including
• a projecting optical system for projecting an image of a target for measuring a corneal shape on the cornea,
• a photographing optical system for photographing the target image projected on the cornea;
• and
• shape computing means for obtaining the corneal shape by processing the photographed target image;
• and
• comparing means for comparing the first ablation amount with an actual ablation amount resulted by the first ablation and obtained based on the corneal shapes measured before and after the first ablation,
• wherein the ablation amount computing means obtains a second ablation amount based on the total ablation amount, the actual ablation amount and a result of the comparison,
• the determining means determines second control data for second ablation by the ablation means based on the second ablation amount, and
• the control means controls the second ablation based on the second control data.