Surgery – Instruments – Light application
Patent
1995-11-27
1997-04-15
Sykes, Angela D.
Surgery
Instruments
Light application
A61N 506
Patent
active
056204370
ABSTRACT:
An operation apparatus for ablating the cornea by laser beam and correcting ametropia of the eye comprising a diaphragm with variable aperture, which is disposed on the optical path along which the laser beam is irradiated on the cornea, a shading member for shading the aperture of the diaphragm in the meridian diameter direction of the aperture, which is capable of varying the shading area to the aperture of the diaphragm by changing the turning angle to the optical path, in which aperture diameter of the diaphragm and variation in scope of the shading area by the shading member being controlled, and a beam rotator disposed in the eye side to the diaphragm rotates the laser beam passed through the aperture of the diaphragm about the optical path, whereby the cornea is ablated thicker at the periphery than at the center so as to correct hypermetropia.
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Harris-Ogugua Sonya
Nidek Co. Ltd.
Sykes Angela D.
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