Surgery – Instruments – Light application
Patent
1996-10-29
1998-09-01
Bahr, Jennifer
Surgery
Instruments
Light application
A61N 506
Patent
active
058004246
ABSTRACT:
An apparatus for use in operating upon a cornea of an eye comprises a light delivery optical system for delivering an ultraviolet laser beam emitted from a laser source onto the cornea, a diaphragm with an aperture, disposed in the light delivery optical system, for restricting an irradiation area of the laser beam, a device for shifting the laser beam with respect to an optical axis of the light delivery optical system, a device for rotating the laser beam about the optical axis of the light delivery optical system at each shifting position to ablate the cornea circularly, a device for inputting information necessary for determining the shape of the postoperation cornea, a device for determining ablation amount at each shifting position of the laser beam by the beam shifting device, based on the information input through the input device, and a device for controlling the laser source and action of the beam rotating device based on the ablation amount determined by the ablation amount determining device at each shifting position, wherein the laser beam ablates the cornea of the eye to correct ametropia including hypermetropia.
REFERENCES:
patent: 4953969 (1990-09-01), Fedorov
patent: 4994058 (1991-02-01), Raven et al.
patent: 5445633 (1995-08-01), Nakamura et al.
patent: 5470329 (1995-11-01), Sumiya
patent: 5569238 (1996-10-01), Shei et al.
Bahr Jennifer
Harris-Ogugua Sonya
Nidek Co. Ltd.
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