Contact lenses with surfaces having different softness
US12072556B2 · kind B2 · utility
0Cited by
127References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2020 |
| Grant date | Aug 27, 2024 |
| Priority date | — |
| Expiry date | Dec 23, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2083/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention is related to a contact lens, especially a SiHy contact lens, which comprises a lens bulk material covered with an outer surface hydrogel layer thereon and has a posterior surface and an opposite anterior surface. The outer surface hydrogel layer consists of an anterior outer hydrogel layer and a posterior outer hydrogel layer. A contact lens of the invention is characterized by having a difference in surface softness between its posterior (BC) and anterior (FC) surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.