Prototype Lens (IMAGE) University of Leeds Caption A prototype of an electrically switchable contact lens previously developed by the same group of collaborators. The lens makes use of liquid crystals, a material used in the vast majority of TV and smartphone screens. Credit None Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.