Department of Optometry, Kangwon National University, Samcheok, Korea.
PLoS One. 2020 May 29;15(5):e0234066. doi: 10.1371/journal.pone.0234066. eCollection 2020.
The aim of our study was to quantitatively evaluate the optical properties of photochromic lenses available on the market under cold and warm temperatures corresponding to the winter and summer seasons. The transmittance of 12 photochromic lenses from five manufacturers was measured using an UV/VIS spectrophotometer at cold (6 ± 2°C) and at warm (21 ± 2°C) temperatures. Transmittances were recorded from 380 to 780 nm and at the wavelength with maximum absorbance, which was calculated from the transmittance. The characteristics of the lenses were evaluated by examining changes in the optical properties at colorless and colored states and in the fading rate depending on temperature. The wavelength with maximum absorbance for photochromic lenses at the cold temperature showed a shorter shift than that at the warm temperature. The photochromic properties at the cold temperature were 11.5% lower for transmittance, 1.4 times higher for the change in optical density, and 1.2 times higher for the change in transmittance in the colored and colorless states, optical blocking % ratio, and change in luminous transmittance as compared to those at the warm temperature in the colored state. The fading rates based on the half-life time at the cold temperature were from 2.7 to 5.4 times lower than those at the warm temperature. The fading time until 80% transmittance was 6.4 times longer at the cold as compared to that at the warm temperature. There were significant differences in the optical properties of the photochromic lenses in terms of an absorbance at a shorter wavelength, a lower transmittance, a higher optical density, optical blocking % ratio, and luminous transmittance at the cold as compared to the warm temperature. Hence, it is necessary to provide consumers with information on photochromic optical properties, including the transmittance in colored and colorless states, and the fading rates at temperatures corresponding to the summer and winter seasons for each product.
我们的研究目的是定量评估市场上的光致变色镜片在对应冬夏两季的冷温和高温下的光学特性。在冷温（6±2°C）和暖温（21±2°C）下，使用紫外可见分光光度计测量了来自五个制造商的 12 种光致变色镜片的透光率。透光率记录范围从 380nm 到 780nm，并在最大吸收波长处记录，该波长是从透光率计算得出的。通过检查无色和有色状态下光学性能的变化以及随温度的褪色率，评估镜片的特性。光致变色镜片在冷温下的最大吸收波长的偏移比在暖温下短。在冷温下，光致变色镜片的透光率降低 11.5%，光学密度变化增加 1.4 倍，在有色和无色状态下的透光率变化增加 1.2 倍，光学阻挡率%和光透过率变化增加。与暖色状态相比，冷温下的褪色率基于半衰期的变化降低了 2.7 至 5.4 倍。在冷温下，透光率达到 80%的褪色时间比在暖温下长 6.4 倍。在冷温下，光致变色镜片的光学特性在较短的波长吸收、较低的透光率、较高的光学密度、光学阻挡率%和光透过率方面与暖色相比存在显著差异。因此，有必要为消费者提供有关光致变色光学特性的信息，包括在有色和无色状态下的透光率以及对应于夏季和冬季的每个产品的温度的褪色率。
