Offset ablation profiles for treatment of irregular astigmation
US6245059A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00893
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides near-term customized ablation capabilities for treatment of corneal irregularities by ablating laterally offset refractive therapy profiles. These treatment profiles may, when centered on the eye, be suitable for treatment of standard refractive errors such as myopia, hyperopia, and cylindrical astigmatism. By selectively offsetting one or more of these ablation profiles at selected points across the corneal surface, the laser system can reduce refractive errors resulting from corneal irregularities such as irregular astigmatism, corneal steepening in one quadrant, asymmetrical astigmatism, irregularities inadvertently produced by a prior refractive treatment (such as radial keratotomy incisions, a decentered ablation, or the like), granular dystrophy, diffuse, asymmetric warpage as a result of post-corneal transplants, bilateral keratoconus, penetrating keratoplasty, or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.