Progressive ophthalmic lens
US7338163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | May 31, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an ophthalmic lens for long-sighted and intermediate vision comprising a complex surface provided with an optical centre, a substantially umbilicated meridian line and an average size sphere progression on the top surface equal to or greater than 0.50 diopters. The complex surface is provided in the top part thereof with a long-sighted vision area which is formed by cylinder points equal to or less than 0.25 diopters and covers an angular sector focused on the optical centre and whose angle is equal to 160°. Said complex surface also comprises an average size substantially constant sphere on the meridian line in the long-sighted vision area and a progression length equal to or less than 12 mm. Said progression length is defined as a vertical distance between the optical centre and a median point for which the average sphere if greater than 85% of progression on the average sphere in the optical centre. The inventive lens is suitable for driving and prescribed to persons having additional prescription greater than a power progression, whereby a correction adaptable to the power prescription of a longsighted vision person is provided in the top part of the le…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.