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KMID : 1011420170220010023
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 1 p.23 ~ p.31
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Evaluation of Fading Rate of Photochromic Lenses in Domestic Market
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Yu Dong-Sik
Cho Hyun-Gug
Moon Byeong-Yeon
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Abstract
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Purpose: This study aimed to evaluate the fading rate and factors affecting the performance of photochromic lenses.
Methods: Thirty six brands of photochromic lenses were collected from 14 companies in domestic market. Transmittances (T%) of the lenses depending on time were measured within visible wavelength after activated (colored) state by UV irradiation. An UV/VIS spectrometer was used to obtain the transmittance. Fading rates were evaluated by half-life time (t1/2), and fading time to the 80% transmittance (T80%).
Results: The performance of photochromic lenses was better expressed as the difference between colorless and colored state (ΔT%) than the change of optical density (ΔOD) and optical blocking % ratio (block %). For the t1/2 of photochromic lenses, coating method was significantly faster than those of imbibition and casting method (one-way ANOVA, p=0.001). For the T80% of the lens with high index was significantly faster than middle index (student’s t-test, p=0.034), and the lens with gray color was significantly faster than brown color (student’s t-test, p=0.005). But the T80% had no significant correlation with t1/2. The photochromic action had a wide variety of 14.9% to 48.9% for ΔT%, 44 sec to 217 sec for t1/2, and 127sec (2′ 07″) to 3,523 sec (58′ 43″) for T80%.
Conclusions: The performance of photochromic lenses based on fading rate had a large difference among brands. Therefore, the manufacture companies should provide consumer and agent with correct photochromic information (ΔT%, t1/2, T80%) in relation to fading rate.
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KEYWORD
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Photochromic lens, Fading rate, Half-life time, Transmittance, Domestic market
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