Patent ID: 8523846

Claim:
A corneal surgery apparatus, which comprises: a laser irradiation optical system capable of changing an irradiation position with a laser beam emitted from a laser source on a cornea of a patient's eye; and an eye position change detection unit, which comprises: an illumination optical system arranged to illuminate an anterior-segment of the patient's eye with infrared illumination light; and an image pick-up camera arranged to pick up an image of the anterior-segment illuminated by the illumination optical system, and is arranged to detect change in eye position including torsion of an eyeball of the patient's eye subjected to a surgical operation based on an iris pattern in the anterior-segment image picked up with the image pick-up camera, and is arranged such that the irradiation position with the laser beam which is applied by the laser irradiation optical system tracks movement of the patient's eye based on a result of the detection by the eye position change detection unit, and the cornea is ablated to a desired shape by the application of the laser beam, wherein the corneal surgery apparatus further comprises a control unit arranged to extract the iris pattern at an iris portion and a background of the iris pattern based on luminance information on the anterior-segment image picked up with the image pick-up camera, and adjust at least one of a set value of an illumination light amount of the illumination optical system and a set value of a gain of the image pick-up camera so that a luminance difference between the iris pattern and the background of the iris pattern is maximized or exceeds a predetermined reference value, and luminance at the iris pattern at the iris portion and the background of the iris pattern is not saturated.