Abstract
Purpose: As contact lens materials have developed, the relevance of mechanical properties and particularly the modulus (stiffness) has been a matter of considerable debate. As poly(methyl methacrylate) (PMMA) began to be replaced by more oxygen permeable materials, dimensional stability and lens durability were key concerns. The spectrum of materials used for manufacture has since expanded to encompass much softer hydrogels. Although modulus was initially used as a comparative factor for specific aspects of materials performance, is now understood to influence factors such as initial comfort. The aim of this poster is to explore modulus changes over the last 50 years.
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