Method of making a spectacle lens providing an astigmatic correction and spectacles including said spectacle lens
US9459468B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 2013 |
| Grant date | Oct 4, 2016 |
| Priority date | — |
| Expiry date | May 23, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of making a spectacle lens providing at least an astigmatic correction includes measuring a direction of an axis of an astigmatism of an eye for each of three different directions of gaze of the eye. Thereafter, a position of the spectacle lens is determined relative to the eye. A shape of a surface of the spectacle lens is computed based on the determined position of the spectacle lens relative to the eye and the at least three measured directions of the axis of the astigmatism. A primary orientation of the eye is determined based on the three measured directions of the axis of the astigmatism. The shape of the surface of the spectacle lens is calculated based on the determined position of the spectacle lens relative to the eye and by applying Listing's Law based on the determined primary orientation of the eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.