Reverse progressive lenses
US7832861B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Dec 28, 2009 |
| Grant date | Nov 16, 2010 |
| Priority date | — |
| Expiry date | Dec 28, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of making a reverse progressive lens has the steps of selecting a standard progressive lens having a distance zone, a transition zone and a near zone; selecting an add determination that is double or more than double in power; reversing the regular progressive lens by orienting it upside down; and cutting away the near zone so that the transition zone becomes the new near zone. To maintain convergence of the corridor channel, one by orders the OS lens with the OD power and the OD lens with the OS power. The method also includes measuring a distance PD, measuring the segment height and keeping the same cylinder axis such that rotating the lens 180° does not change the axis position. Selecting a standard progressive lens may include one with a distance zone, a corridor/transition zone and a near zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.