Purpose

This study evaluates the spectral transmission of photochromic contact lenses.

Method

A custom built photochromic filter transmission testing device (ICS photochromic bench) was developed to measure the spectral transmission of light adaptive filters. The spectral properties of seven contact lenses were measured using the ICS photochromic bench at 23⁰C and 35⁰C in their exposed (darkening) state at time points 0 s, 45 s, 90 s, and 15 min. and their unexposed (fading) state at 45 s, 15 min. and 20 min.. Mixed between and within repeated measures ANOVA (MRM-ANOVAs) and generalized additive modeling (GAMs) were used to compare the effects of temperature and solar exposure time on spectral transmittance of photochromic contact lenses.

Results

The mean (±SD) transmission of photochromic contact lenses in the exposed state were 94.7 ± 0.2, 39.1 ± 1.4, 27.0 ± 0.7 and 14.7 ± 1.0, and 93.7 ± 0.9, 38.8 ± 2.4, 30.2 ± 1.8, and 26.1 ± 1.0 at times 0 s, 45 s, 90 s, and 15 min. at 23⁰C and 35⁰C respectively. The mean (±SD) transmission of photochromic contact lenses in the unexposed state were 18.3 ± 1.5, 71.3 ± 2.4, and 80.2 ± 2.4, and 39.1 ± 1.0, 90.6 ± 1.0 and 91.1 ± 0.9 at times 45 s, 15 min. and 20 min. at 23⁰C and 35⁰C respectively. There was a significant decrease in light transmission as solar exposure time increased (GAM, MRM-ANOVA, p < 0.05). There was a significant effect of temperature and solar exposure time on the photochromic contact lenses (GAM, MRM-ANOVA, p < 0.05). The differences in the light transmitted by the photochromic contact lenses occurred at time 90 s and 15 min (Tukey HSD, at 90 s and 15 min, p < 0.05), where contact lenses at a temperature of 35⁰C showed greater light transmission than that at 23⁰C. There were differences in spectral transmittance based on the temperature of the contact lens. Contact lenses at 35⁰C transmitted more light than at 23⁰C at all unexposed times (MRM-ANOVA, p < 0.05).

Conclusion

Spectral transmission of photochromic contact lenses were successfully measured with the ICS photochromic bench. Temperature appears to influence both the activation and deactivation of photochromic contact lenses such that the higher the temperature, the greater the light transmission.

中文翻译：

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测定光致变色隐形眼镜的光谱透射率

目的

本研究评估了光致变色隐形眼镜的光谱透射率。

方法

开发了一种定制的光致变色滤光片透射测试装置（ICS 光致变色台）来测量光自适应滤光片的光谱透射率。在 0 秒、45 秒、90 秒和 15 分钟的暴露（变暗）状态下，使用 ICS 光致变色台架在 23⁰C 和 35⁰C 下测量七种隐形眼镜的光谱特性。以及它们在 45 秒、15 分钟时的未曝光（褪色）状态。和 20 分钟。在重复测量之间和之内混合使用方差分析 (MRM-ANOVA) 和广义加性模型 (GAM) 来比较温度和太阳照射时间对光致变色隐形眼镜的光谱透射率的影响。

结果

暴露状态下光致变色隐形眼镜的平均 (±SD) 透射率分别为 94.7 ± 0.2、39.1 ± 1.4、27.0 ± 0.7 和 14.7 ± 1.0，以及 93.7 ± 0.9、38.8 ± 2.4、30.2 ± 1.0 和 ± 1.8时间为 0 秒、45 秒、90 秒和 15 分钟。分别在 23⁰C 和 35⁰C。未曝光状态下光致变色隐形眼镜的平均 (±SD) 透射率为 18.3 ± 1.5、71.3 ± 2.4 和 80.2 ± 2.4，以及 39.1 ± 1.0、90.6 ± 1.0 和 91.1 ± 0.9，时间为 45 秒、1.5 秒。和 20 分钟。分别在 23⁰C 和 35⁰C。随着日光照射时间的增加，透光率显着降低（GAM，MRM-ANOVA，p < 0.05 ）。温度和阳光照射时间对光致变色隐形眼镜有显着影响（GAM，MRM-ANOVA，p < 0.05 ）. 光致变色隐形眼镜透射光的差异发生在 90 秒和 15 分钟（Tukey HSD，在 90 秒和 15 分钟，p < 0.05），其中隐形眼镜在 35⁰C 温度下的透光率高于23⁰C。基于隐形眼镜的温度，光谱透射率存在差异。在所有未曝光时间，35⁰C 的隐形眼镜比 23⁰C 的隐形眼镜透射更多的光（MRM-ANOVA，p < 0.05）。

结论

使用 ICS 光致变色工作台成功测量了光致变色隐形眼镜的光谱透射率。温度似乎会影响光致变色隐形眼镜的激活和失活，因此温度越高，透光率越大。