Eyeglass lenses for persons suffering from severe ametropia
US4561736A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1983 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jul 29, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Eyeglass lenses for persons suffering from severe ametropia. The lenses have a convexly shaped object-side front surface (4) and an eye-side rear surface (3) which is aspherically corrected in the central region (6) which comprises at least the main field of view. From this region the rear surface passes into a region in which its meridional inclination approaches the inclination of the front surface. The entire rear surface of the lens is continuously differentiable twice. Such a lens has an appearance which is fully satisfactory esthetically and makes it possible to keep the overall magnification of the system consisting of the eye and the eyeglass lens closer to 1 than in the case of previously known lenses. Aberrations are optimally corrected within a sufficiently large region, and no disturbing discontinuities in the fields of view occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.