Scleral-corneal contact lens
US5929968A · kind A · utility
Inventors
Key dates
| Filing date | Apr 7, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Apr 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A contact lens is formed of rigid gas permeable material and covers the cornea and a small adjacent portion of the sclera of an eye. The posterior surface of the lens has a radially outer portion that generally conforms with the shape of the ocular surface in the scleral region. The posterior surface of the lens covering the corneal region of the eye is selectively spaced from, aligned with, or in eyelid bearing pressure contact with, the corneal region of the eye, whereby the eyelid bearing pressure is controllably distributed over both the scleral and corneal regions of the eye. The contact lens is comfortable to wear, not prone to unintended dislodgement during periods of physical activity, and can be worn after surgical treatment of the cornea and is thinner and much smaller than previous scleral contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.