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KMID : 1036620190070011232
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Journal of Korean Clinical Health Science
2019 Volume.7 No. 1 p.1232 ~ p.1237
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Comparison of tear film break-up time and high order aberration according to soft contact lens material
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Kim Bong-Hwan
Han Sun-Hee
Kim Hak-Jun
Bae Sang-A
Son Yu-Jin
Kim Ji-Hyun
Kim Hyun-Ji
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Abstract
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Purpose: In this study, two types of soft contact lenses with different materials were selected to compare the time of tear film destruction and high order aberrations before and after wearing.
Methods: Thirty patients (60 eyes) in their 20s were included in this study. Two lenses with different materials, Group 4 (Etafilcon A) and Group 5 (Narafilcon A) were selected. Using aberration analyzer and keratometry, high-order aberration and tear film test (NIF-BUT, NIAvg-BUT) were performed before and after wearing.
Results: When comparing the higher aberrations of the Etafilcon A and Narafilcon A lenses, the higher aberrations of the Narafilcon A lens were higher overall. For the initial tear film break-up time (NIF-BUT) after wearing, the Etafilcon A lens was reduced by 4.0 seconds and the Narafilcon A lens increased by 0.6 seconds. For the mean tear film break-up time (NIAvg-BUT) after wearing, the Etafilcon A lens decreased by 2.4 seconds and the Narafilcon A lens increased by 1.7 seconds.
Conclusions: NIF-BUT and NIAvg-BUT of Narafilcon A lens were increased. The lens with relatively low water content and higher oxygen permeability than the lens with high water content has relatively less tear evaporation, which means that the time of destruction of the tear film is increased.
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KEYWORD
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High order aberration , Moisture content , Oxygen permeability , Soft contact lenses , Tear film break-up time
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