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KMID : 1011420140190010043
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 1 p.43 ~ p.49
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Influence of Wetting Agents on Physical Properties of Soft Contact Lens
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Lee Min-Jae
Sung A-Young
Kim Tae-Hun
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Abstract
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Purpose: The physical and optical characteristics of hydrophilic contact lens polymerized with addition of glycerin and PVP(polyvinylpyrrolidone) in the basic hydrogel contact lens material were evaluated.
Methods: This study used glycerin and PVP(polyvinylpyrrolidone) with the cross-linker EGDMA (ethylene glycol dimethacrylate), HEMA (2-hydroxyethyl methacrylate) and the initiator AIBN (azobisisobutyronitrile) for copolymerization.
Results: Measurements of the physical characteristics of the copolymerized material including PVP(polyvinylpyrrolidone)
showed the refractive index of 1.4382~1.4288, tensile strength of 0.3446~2542 kgf and water content and contact angle of sample showed the increase of 13.49% and decrease of 21.44% independently. And also, the physical characteristics of the copolymerized material including glycerin showed the refractive index of 1.4330~1.4328, tensile strength of 0.2974~0.2854 kgf, water content 35.58~36.53% and contact angle of sample showed the decrease of 37.64%.
Conclusions: Based on the results of this study, the produced copolymers is suitable for conventional lens with high wettability. Also, glycerin minimized the changes of water content and refractive index at the same time, increased the wettability of the hydrogel lens materials.
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KEYWORD
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Wettability, Contact angle, Glycerin, Polyvinylpyrrolidone
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