Study on ITO Fresnel Pattern Liquid Crystal Lens

Abstract

Everyone is getting old and the presbyopia arise. Conventional presbyopia correction lenses include convex lenses and progressive lenses, each of which has advantages and disadvantages. The convex lens is a short focal length lens, which has the advantage of being able to see immediately when looking at the close, but has the disadvantage that the lens is thick, heavy, and the glasses have to be removed when looking at the distance. Progressive Lens is a multifocal lens that can focus from near to far. It is relatively thin compared to convex lenses, but requires an adaptation period of about 1 to 2 months. To solve this problem, we developed light, thin, and variable refractive index ITO Fresnel pattern lenses using liquid crystals.[1] ITO Fresnel patterns were formed by photo lithography, and the voltages were applied differently for each pattern to drive the liquid crystals, and the focal length was changed as the applied voltage changed. The diopter (D) of the lens has changed over 9V, and showed the maximum diopter of 1 at 13V.[1] Li, Guoqiang, et al. "Switchable electro-optic diffractive lens with high efficiency for ophthalmic applications." Proceedings of the National Academy of Sciences 103 (16), pp.6100-6104 (2006)