초록 ▼

A method for treating presbyopia by performing ablative photodecomposition of the corneal surface. The offset image of a variable aperture, such as a variable width slit and variable diameter iris diaphragm, is scanned in a preselected pattern to perform ablative sculpting of predetermined portions

A method for treating presbyopia by performing ablative photodecomposition of the corneal surface. The offset image of a variable aperture, such as a variable width slit and variable diameter iris diaphragm, is scanned in a preselected pattern to perform ablative sculpting of predetermined portions of a corneal surface. The scanning is performed to ablate an optical zone sized to match the patient pupil with a peripheral transition zone outside the pupil. The shape of the ablated optical zone is different from the shape of the final optical correction on the anterior surface of the cornea. The optical zone corrects for near-vision centrally and far-vision peripherally. A movable image displacement mechanism enables radial displacement and angular rotation of the profiled beam exiting from the variable aperture. The method enables wide area treatment with a laser having a narrower beam than the treatment area, and can be used in the treatment of many conditions in conjunction with presbyopia such as hyperopia, hyperopic astigmatism and irregular refractive aberrations.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for reprofiling an anterior surface of a cornea of an eye from an initial shape to a multifocal aspheric shape for correcting presbyopia, the method comprising the steps of:(i) aligning a laser system with the eye, the laser system being operable to deliver abl

[ What is claimed is:] [1.]1. A method for reprofiling an anterior surface of a cornea of an eye from an initial shape to a multifocal aspheric shape for correcting presbyopia, the method comprising the steps of:(i) aligning a laser system with the eye, the laser system being operable to deliver ablative radiation to the cornea;(ii) ablating a surface of the cornea to an ablated shape by selectively exposing the cornea to the ablative radiation so that an optical zone extends across the pupil and is scaled to a dimension of a pupil with a transition zone disposed beyond the pupil; and(iii) covering the ablated surface to produce a final aspheric anterior corneal surface.