Composition for producing ultraviolet blocking lenses
First Claim
1. A lens forming composition, comprising;
- a monomer;
a photoinitiator that activates a co-initiator after being exposed to at least a portion of activating light during curing, wherein the co-initiator activates curing of the monomer to form the eyeglass lens, and wherein the co-initiator comprises an acrylyl amine; and
a photochromic compound; and
wherein the lens forming composition is curable by exposure to activating light having a wavelength below 400 nm to form a substantially clear and aberration free eyeglass lens in a time period of less than about 10 minutes.
2 Assignments
0 Petitions
Accused Products
Abstract
An eyeglass lens forming composition containing light absorbing compounds which may undergo light initiated polymerization is provided. Typically, lens forming compositions that absorb light do not permit enough activating radiation to penetrate into the depths of the lens cavity to adequately initiate polymerization of the lens forming composition. An embodiment of the invention provides a system and method for curing such a lens forming composition to form a lens that does not transmit ultraviolet light. Activating light is used having a wavelength greater than the wavelengths of light which the light absorbing compounds absorb. The power of the formed lenses may be controlled by varying the lens forming conditions. Additionally, the lens forming process may be controlled using a microprocessor based control system.
-
Citations
17 Claims
-
1. A lens forming composition, comprising;
-
a monomer;
a photoinitiator that activates a co-initiator after being exposed to at least a portion of activating light during curing, wherein the co-initiator activates curing of the monomer to form the eyeglass lens, and wherein the co-initiator comprises an acrylyl amine; and
a photochromic compound; and
wherein the lens forming composition is curable by exposure to activating light having a wavelength below 400 nm to form a substantially clear and aberration free eyeglass lens in a time period of less than about 10 minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification