Tensile properties of soft contact lens materials | 合法醫療器材資訊網

由ITranoudis著作·2004·被引用119次—MaterialsmadefromVP/MMAexhibithightensilestrengthandhigh-to-moderateelongation-at-break,buttheYoung'smodulusishighforthe55%watercontentand ...

The strength of contact lens materials is an important consideration with respect to resistance to damage during lens handling and long term durability, and may govern some aspects of in-eye lens performance. The tensile properties of hydrogel contact lenses manufactured from eight different materials were examined in a series of clinical and laboratory experiments using the Instron 1122 Universal Testing Instrument. Lenses from the following eight materials (and nominal water contents) were used: HEMA/VP 40%, HEMA/VP 55%, HEMA/VP 70%, VP/MMA 55%, VP/MMA 70%, HEMA 40%, HEMA/MAA 55% and HEMA/MAA 70% (HEMA: 2-hydroxy-ethyl methacrylate, VP: vinyl pyrrolidone, MMA: methyl methacrylate, MAA: methacrylic acid). Tensile strength, elongation-at-break and Youngs modulus were measured. A technique was devised that enables three parallel-sided specimens of identical width to be cut from a single contact lens with good accurac...