Ophthalmic lens element
US8833936B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2010 |
| Grant date | Sep 16, 2014 |
| Priority date | — |
| Expiry date | Nov 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A progressive ophthalmic lens element is disclosed. The progressive ophthalmic lens element includes an upper viewing zone, a lower viewing zone, a corridor, and a peripheral region disposed on each side of the lower viewing zone. The upper viewing zone includes a distance reference point (DRP) and a fitting cross, and provides a first refractive power for distance vision. The lower viewing zone, which is for near vision, provides an addition power relative to the first refractive power. The corridor connects the upper and lower zones and provides a refractive power varying from that of the upper viewing zone to that of the lower viewing zone. Each peripheral region includes a zone of positive power relative to the addition power which provides therein a positive refractive power relative to the refractive power of the lower viewing zone. The zones of relative positive power are disposed immediately adjacent to the lower viewing zone such that the lower viewing zone interposes the zones of relative positive power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.