公开(公告)号：US20210371731A1

公开(公告)日：2021-12-02

申请号：US17335628

申请日：2021-06-01

Applicant: Alcon Inc.

Inventor： Feng Jing ,  Frank Chang ,  Houliang Tang

IPC: C09K9/02 ,  C08F230/08 ,  B29D11/00

Abstract: Described herein is a cost-effective and time-efficient method for producing photochromic contact lenses, in particular, preferably photochromic silicone hydrogel contact lenses, from a polymerizable composition comprising an unique selection and combination of main polymerizable components, a photochromic compound and a visible-light photoinitiator, based on the Lightstream Technology™. This invention also provides photochromic contact lenses or more preferably photochromic silicone hydrogel contact lenses made according to a method of the invention. A photochromic contact lens of the invention is capable of undergoing a reversible color change upon exposure to UV-irradiation or high-energy-violet light (HEVL) (with wavelengths from 380 nm to 440 nm).