Method and system for laser treatment of refractive errors using offset imaging
US6755818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00882
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.