Spectacle eyeglass for myopic child
US8807747B2 · kind B2 · utility
9Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2009 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Mar 5, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spectacle eyeglass of progressive addition type has been designed for myopic children. To this purpose, an ergorama has been constructed, taking into account vision conditions encountered by the children in their everyday life. In particular, the eyeglass has a limited optical power increase between two reference eye directions (D1, D2), a start (D0) of the optical power increase which is located quite low in the eyeglass, and an offset value (OS) for a meridian line (ML) which is higher than that of eyeglasses designed for adults.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.