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KMID : 1011420200250020145
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 2 p.145 ~ p.153
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Comparison of Changes in Physical Characteristics of Daily Disposable and 3-day Usable Contact Lenses over 3 Days of in Vitro Use
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Song Sun-Jung
Kim Ki-Hong
Chu Byoung-Sun
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Abstract
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Purpose: The study compared changes in physical properties of daily disposable and 3-day-lenses (3-day wearing lenses) over 3 days in vitro.
Methods: Artificial Tear Solution (ATS) was prepared to simulate the actual composition of tears. Three types of single-use disposable contact lenses (senofilcon A, delefilcon A, filcon II 3) and 3-day wearing lenses (silicone tripolymer) were soaked in the artificial tear solution, inside an incubator at 37oC with 150 rpm for 12, 24, and 48 hours. Oxygen transmissibility and visible light transmittance were measured, and the lens surface was observed over time.
Results: The initial oxygen permeability (Dk/t) of the 3-day wearing lenses was 13.23, which was significantly lower than that of the three types of disposable lenses at all times. All four lenses showed more than 97% visible light transmission, but after 24 hours, the transmittance of delefilcon A was markedly reduced to less than 80%. Surface observations showed an increase in deposits over time which was greatest for Filcon II 3.
Conclusions: Three-day wearing lenses seem likely to cause problems due to hypoxia as a result of the low oxygen permeability. Delefilcon A is expected to blur vision after 24 hours, and filcon II 3 in the high water content group should be avoided in patients with high protein levels in tears. In addition, the safety of the 3-day wearing lenses could not be determined in this study.
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KEYWORD
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Daily disposable lenses, 3-days lenses, Oxygen transmissibility, Visible light transmittance, SEM (scanning electron microscope)
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