Methods for the manufacture of photoabsorbing contact lenses and photoabsorbing contact lenses produced thereby
US12128641B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2023 |
| Grant date | Oct 29, 2024 |
| Priority date | — |
| Expiry date | May 19, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0018
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Provided is a method for manufacturing photoabsorbing contact lenses and photoabsorbing contact lenses produced thereby. The method comprises: (a) providing a mold assembly comprised of a base curve and a front curve, the base curve and the front curve defining and enclosing a cavity therebetween, the cavity containing a reactive mixture, wherein the reactive mixture comprises at least one polymerizable monomer, a photoinitiator which absorbs at an activating wavelength, and a photoabsorbing compound which displays absorption at the activating wavelength; and (b) curing the reactive mixture to form the photoabsorbing contact lens by exposing the reactive mixture to radiation that includes the activating wavelength, wherein the radiation is directed at both the base curve and the front curve of the mold assembly, and wherein the radiation's radiant energy at the base curve is greater than the radiation's radiant energy at the front curve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.