Progressive reading and intermediate distance lens defined by employment of a zernike expansion
US8382282B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2008 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Aug 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided a lens that includes a surface having a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said lens. The second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length. The lens has surface astigmatism less than or equal to about 0.5 diopter within said corridor, and is a progressive addition lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.