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KMID : 1159320200220040435
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Korean Journal of Vision Science
2020 Volume.22 No. 4 p.435 ~ p.443
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Physical Properties of Hydrophilic Silicone Contact Lenses with High Durability
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Heo Ji-Won
Shin Su-Mi
Sung A-Young
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Abstract
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Purpose : The optical characteristics of isobornyl methacrylate and 2-(trifluoromethyl)styrene were analyzed to produce a functional silicone contact lens containing silicone and hydrophilic monomer.
Methods : Silicone was produced by copolymerizing a silicone monomer, with N,N-dimethylacrylamide (DMA), a hydrophilic monomer, ethylene glycol dimethacrylate (EGDMA), a cross-linking agent, and azobisisobutyronitrile (AIBN), an initiator. For additives, isobornyl methacrylate and 2- (trifluoromethyl)styrene were used separately. To examine the changes in physical properties of the fabricated contact lens, spectral transmittance, refractive index, oxygen permeability, and tensile strength were measured.
Results : The oxygen permeability of the produced hydrophilic contact lens was 33.22×10-11 (cm2/s)(mlO2/ml×mmHg) due to the effect of silicone. As the amount of the additive, isobornyl methacrylate increased, the refractive index improved somewhat and the spectral transmittance in the visible spectrum improved by approximately 15%, producing a transparent contact lens. Furthermore, the tensile strength improved by approximately 45% with the addition of 2- (trifluoromethyl)styrene.
Conclusion : It was confirmed that the silicone contact lens fabricated in this study satisfies the basic physical properties of the contact lens and has high oxygen permeability. It was also confirmed that the compatibility was improved by adding isobornyl methacrylate, and the durability was improved by adding 2-(trifluoromethyl)styrene. Therefore, it is considered that the two additive materials can be used in various ways as a contact lens material according to the improved compatibility and durability of the silicone contact lens.
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KEYWORD
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Compatibility, Durability, Silicone contact lens
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