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KMID : 1159320190210020239
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Korean Journal of Vision Science
2019 Volume.21 No. 2 p.239 ~ p.247
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A Study on the Tint Performance of Photochromic Lens by Temperature and Time
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Ko Kyung-Ho
Jeon In-Chul
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Abstract
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Purpose : We want to identify the effect on the performance of photochromic lenses as the temperature increases. We are going to present basic data to photochromic lenses suppliers and consumers.
Methods : The targets were 12 different types of photochromic lenses with refractive index of 1.56 and 1.60. The density of color was measured after exposed to ultraviolet radiation for one to five minutes at 20?C, 30?C, 40?C, and 50?C temperature using the thermostatic retention device. The density analysis was performed using a camera and the discoloration process was photographed as a movie, and the brightness of the center portion was measured using a Photoshop program (Adobe Photoshop CS5).
Results : The results of exposure to ultraviolet light at 20?C showed that changes in discoloration concentration were 69%(1 min), 76%(2 min), 78%(3 min), 78%(4 min) and 79%(5 min). The results of exposure to ultraviolet light at 50?C were 44%(1 min), 46%(2 min), 46%(3 min), 48%(4 min) and 50%(5 min). The refractive index 1.56 was 73%(1 min), 81%(2 min), 84%(3 min), 84%(4 min) and 85%(5 min), after exposed to ultraviolet radiation at 20?C. The discoloration concentration was the highest at 20?C and at 50?C it showed 41%(1 min), 43%(2 min), 43%(3 min), 44%(4 min, and 47%(5 min). The refractive index of 1.60 was 79%(1 min), 84%(2 min), 85%(3 min), 85%(4 min) and 85%(5 min) after exposing to ultraviolet light at 20?C. At 50?C, it was shown 41%(1 min), 41%(2 min), 43%(3 min), 43%(4 min) and 45%(5 min). The photochromic lenses produced by the coating method showed a discoloration concentration of 79%, and the monomer method showed a discoloration concentration of 76%. At 30?C, the coating method was 74%, the monomer method was 72%. At 40?C, the coating method was 68%, and the monomer method was 66%. At 50?C, the coating method was 52%, and the monomer method was 48%.
Conclusion : The concentration of discoloration decreased with increasing temperature when exposed to ultraviolet light for the same time. In both 1.56 and 1.60 refractive index, the discoloration concentration decreased with increasing temperature (from 20?C). It was found that the photochromic lenses manufactured by the coating method were changed more darkly at the same temperature than that of the photochromic lenses manufactured by the monolithic method.
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KEYWORD
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Color change, Outdoor activity, Photochromic lenses, Temperature, Transitions lenses
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