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KMID : 1011420230280030167
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 3 p.167 ~ p.175
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Changes in Soft Contact Lens Parameters according to Exposure Time to Blue Light
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Lee So-Joung
Choi Hyun-Dong
Kim Min-Ji
Yang Yu-Jin
Park Mi-Jung
Kim So-Ra
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Abstract
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Purpose : This study aimed to investigate whether the parameters of soft contact lenses (hereinafter “soft lenses”) change due to exposure to blue light.
Methods : A total of six lenses available on the domestic market were selected including four hydrogel lenses from FDA groups 2 and 4 and two silicone hydrogel lenses in FDA group 5, and exposed to emissions from blue light-emitting diodes for 10, 20, and 30 min, respectively. The back vertex power, total diameter, base curve, center thickness, and water content of the lenses were measured before and after blue light exposure, and the degree of change was analyzed according to the tolerance of Korean standards (KS).
Results : Hilafilcon B showed the most significant changes after blue light exposure, whereas senofilcon A showed the least significant changes. Changes in total diameter, base curve, and water content exceeded the KS tolerance in hilafilcon B and B-t lenses regardless the blue light-exposure time. The back vertex power was only altered in hilafilcon B lenses after 20 min of blue light exposure. Methafilcon A and A-b lenses only exhibited changes in water content after 20 to 30 min of blue light exposure. Changes in water content were found in narafilcon A and senofilcon A lenses regardless of blue light-exposure time. Narafilcon A lenses also exhibited changes in total diameter after 10 to 20 min of blue light exposure; however, no change in the center thickness exceeded the KS tolerance.
Conclusions : The parameters that changed significantly differed for each material when soft lenses were exposed to blue light, and some parameters exhibited changes exceeding the KS tolerance. Since changes in water content were detected in all soft lenses tested regardless of the exposure time, soft lens wearers frequently exposed to blue light should consider reducing their wearing time and lens replacement cycle.
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KEYWORD
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Blue light, Soft contact lenses, Lens parameter, Korean standards
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