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KMID : 1011420180230020073
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 2 p.73 ~ p.84
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The Changes in Surface and Composition Ratio of Coating Films on Colored Spectacle Lenses by Thermal Stress
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Lee Sung-Sil
Song Jae-Myeong
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: This study was aimed to investigate the changes in composition ratio and surface of colored spectacle lenses made of allyl diglycol carbonate treated with hard coating film, multi-layered coating film, and mirror coating film, respectively, caused by thermal stresses.
Methods: The colored lenses were observed with a digital single lens camera and a polarizing microscope after the exposure for 4 hours at high temperatures of 25, 50, 75, and 100oC, and then further compared with the change in transparent lenses. In addition, the change in composition ratio of the coating films of the colored lenses was analyzed by using a laser-induced breakdown spectroscopy.
Results: The surface changes of hard coating films of the colored lenses were not observed even with thermal stress of 100oC. The surface changes in multi-layered coating and mirror coating films of the colored lenses have been observed at a temperature of 75oC and the surface damages have been detected at a lower temperature compared with the transparent lenses. The composition ratio in coating films of colored lenses was changed by thermal stresses, and the largest change was found in multi-layered coating film.
Conclusions: The coatings of colored spectacle lenses have been found to be more sensitive to thermal stress than those of transparent lenses. In this study, it is suggested that methods for stabilizing the coating films should be considered in the case of colored lenses compared to the transparent lenses. The necessity for storage and management of colored lenses against repeated thermal stress in daily life is also suggested.
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KEYWORD
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Colored spectacle lenses, Thermal stress, Hard coating, Multi-layered coating, Mirror coating, Surface change, Composition ratio
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