Multizone, multipass photorefractive keratectomy
US5904678A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1996 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Jun 17, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00882
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A multizone, multipass photorefractive keratectomy (MP-PRK) technique to treat 315 eyes with the 193-nm VISX 20/20 excimer laser. The procedure includes making multipass ablations that increase in ablative depth to create as step-wise ablation of the corneal to the predetermined dioptric correction. It also includes making multizone ablations that create of variable widths that result in a predetermined ablative depth with smooth transition edges. A combination of multizone, multipass ablations are used to treat astigmatism. New algorithms effectively treat the full range of myopia, including low myopic eyes (-1 to -6 D), moderately myopic eyes (-6 to -10 D); and highly myopic eyes (-10 to -27 D).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.