Variable transmissivity annular mask lens for the treatment of optical aberrations
US5662706A · kind A · utility
195Cited by
9References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2250/0098
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An annular mask lens for the treatment of optical aberrations such as but not limited to night myopia, spherical aberration, aniridia, keratoconus, corneal scarring, penetrating keratoplasty, and post refractive surgery complication. The lens has an annular mask having an aperture larger than conventional pinhole contact lens. The aperture having a "soft" inside edge and which mask has a gradually increasing transmissivity radially toward the outer edge of the mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.