Glass lens with ion-exchanged antireflection coating and process for manufacture thereof

Abstract From the Canadian patent

There is disclosed a glass ophthalmic lens including an ion-exchanged antireflection coating. Metal oxide films including TiO2, CeO2, ZrO2, La2O3, Nd2O3 Al2O3, and SiO2 when, evaporated on glass lenses in a vacuum chamber by electron-beam techniques form hard optical coatings which are chemically stabile at high temperatures and allow potassium and sodium ions to traverse the thickness thereof without changing chemical composition or physical integrity thereby enhancing ability of glass lenses to be ion-exchanged in a conventional ionexchange treatment. This allows antireflection coated glass lenses to pass impact-resistant standards ANZI Z80.1 for prescription ophthalmic lenses and USAS …