A concept for bifocal contact- or intraocular lenses:: Liquid single crystal hydrogels (-LSCH')

The synthesis of liquid single crystal hydrogels (LSCH) in suitable molds offers an innovative concept to realize bifocal contact- or intraocular-lenses. LSCH combine the properties required for applications as bifocal ophthalmic lenses: the soft and water-containing hydrogel enables oxygen permeation and exhibits high birefringence due to the liquid crystalline phase structure built up by rigid rod-like amphiphiles. Via a photo-initiated crosslinking reaction of aqueous solutions of monomeric lyotropic liquid crystalline amphiphiles in the macroscopically ordered liquid crystalline state, We obtain optically uniaxially ordered and transparent LSCH. The orientation process and the phase structure of the anisotropic hydrogel is analyzed by deuterium NMR-spectroscopy. Copyright (C) 2002 John Wiley Sons, Ltd.