Method for producing cost-optimized spectacle lenses with especially advantageous properties for the user
US8678586B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Sep 7, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing spectacle lenses from raw lenses prefabricated in a non-cutting manner uses raw lenses having a central geometric axis standing vertically on them. The lens comprises a convex front side that is formed in a rotationally symmetrical manner about the central axis and is not to be reworked and an opposing back side that is to be reworked with a CNC machine. The front- and back side have at least one optical focal point in common. In order to rework the back side a prescription surface is calculated on the basis of a prescription and of the geometry of the front side. This surface forms a prescription lens in common with the front side, the focal points of which lens correct the visual error of the prescription holder. A spectacle lens with an optical center is produced from the prescription lens for use in an eyeglass frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.