A cemented lens consists of a lens that is tinted and/or contains a UV absorber, and a second lens that is neither tinted nor contains any UV absorber. The cemented lens is formed by placing the two lens elements together with a UV-curable adhesive between them, and then directing UV radiation through...http://www.google.ca/patents/USRE36049?utm_source=gb-gplus-sharePatent USRE36049 - Cemented lens and process for production thereof
