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KMID : 1011420190240030231
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 3 p.231 ~ p.237
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Physical Properties of Contact Lens accordingto Room Temperature Polymerization Conditions
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Bae Ju-Hyun
Ko Na-Young
Lee Hyun-Mee
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Abstract
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Purpose: The purpose of this study is to investigate the possibilities of producing contact lenses with better properties than those made produced by using conventional methods, by using a new room-temperature (20~30oC) polymerization method and without conventional thermal polymerization.
Methods: The contact lens was prepared by controlling the amounts of catalyst N,N,N',N'-tetramethyl-ethylenediamine (TMEDA) volume (3 ~ 9 μl) and temperature (20~30oC), respectively. The same reactants were used for both the thermal polymerization and room-temperature polymerization; the contact lens properties such as transmittance, water content, refractive index, wettability, and oxygen permeability were measured and compared.
Results: The transmittance of the contact lens was the highest at 25oC. The contact lens showed good optical properties when 3 μl and 5 μl of catalyst were used. The physical properties of the polymerized lens at room temperature were improved regardless of the amount of catalyst under the same conditions, compared with the thermally polymerized lens. When the amount of TMEDA was 5 μl, the polymerization time was reduced, and physical properties such as water content, oxygen permeability, and wettability were significantly improved.
Conclusions: Polymerization conditions with optimum physical properties were obtained by room-temperature polymerization, and the possibility of manufacturing high functionality contact lenses was confirmed.
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KEYWORD
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Contact lens, Room temperature polymerization, Thermal polymerization, Catalyst, Wettability, Oxygen permeability
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