초록 ▼

An ophthalmological surgery system and method for performing ablative photodecomposition of the corneal surface by offset image scanning. The 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 scul

An ophthalmological surgery system and method for performing ablative photodecomposition of the corneal surface by offset image scanning. The 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 with a movable image offset displacement mechanism capable of effecting radial displacement and angular rotation of the profiled beam exiting from the variable aperture. The profiled beam is rotated by rotating the aperture in conjunction with the offset displacement mechanism. The invention enables wide area treatment with a laser having a narrower beam, and can be used in the treatment of many different conditions, such as hyperopia, hyperopic astigmatism, irregular refractive aberrations, post ablation smoothing and phototherapeutic keratectomy.

대표청구항 ▼

[What is claimed is:] [1.]means for directing a laser beam along a path;variable aperture means for profiling said beam to produce a variable area profiled beam, said variable aperture profiling means including a variable width slit; andmeans for scanning the profiled beam over a predetermined area

[What is claimed is:] [1.]means for directing a laser beam along a path;variable aperture means for profiling said beam to produce a variable area profiled beam, said variable aperture profiling means including a variable width slit; andmeans for scanning the profiled beam over a predetermined area of the corneal surface while varying the aperture to change the profiled beam in a predetermined manner, said scanning means including means for varying a radial displacement of the profiled beam from an axis of rotation and means for simultaneously varying the angular position of the profiled beam about the axis of rotation in a predetermined manner.