Disposable Ophthalmic lens
US6851808B2 · kind B2 · utility
20Cited by
6References
47Claims
0Family size
Inventor
Key dates
| Filing date | Nov 16, 2001 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Nov 16, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/125
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic lens with high definition, wide field of view and high magnification has, in one embodiment, a contact lens, an intermediate field lens and an image lens wherein a real image is formed inside the field lens. At least two of the lenses contribute to the magnification and three surfaces of the ophthalmic lens are aspheric to provide a better defined image. The ophthalmic lens is made disposable with high quality plastic lenses and a plastic holder. A portion of the holder changes appearance in response to change in environment to indicate that the disposable lens has been used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.