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KMID : 1011420220270010007
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Journal of Korean Ophthalmic Optics Society
2022 Volume.27 No. 1 p.7 ~ p.13
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Changes in Physical Properties Depending on the Type of Surfactant in the Manufacture of Energy-saving Contact Lenses
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Heo Seong-In
Lee Hyun-Mee
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Abstract
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Purpose: To examine the effect of the types and contents of surfactants on the physical properties of contact lenses manufactured via polymerization at room temperature without using additional energy in the form of heat or ultraviolet radiation.
Methods: 2-hydroxyethyl methacrylate (HEMA), ammonium persulfate (APS), and N,N,N',N'-tertamethylethylenediamine (TMEDA) were used as the hydrophilic monomer, initiator, and initiation reaction accelerator, respectively, to fabricate the contact lenses. The physical properties of contact lenses manufactured at room temperature using four types of non-ionic surfactants were evaluated.
Results: The transmittance of contact lenses was observed to depend heavily on the type and contents of the surfactant-samples using the poloxamer series exhibited relatively high transmittance, while those using the tween series exhibited low transmittance, indicating their unsuitability for use in lenses. The moisture content followed a pattern similar to that of the thermally polymerized lens. The use of surfactants improved the oxygen transfer rate of all the samples, with the maximum improvement corresponding to 10% concentration.
Conclusions: During the manufacture of energy-saving contact lenses, the use of 10% poloxamer-based surfactant yielded the best physical properties.
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KEYWORD
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Contact lens, Room temperature polymerization, Surfactant, Water contents, Oxygen permeability
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