Alabi Emmanuel B, Simpson Trefford L, Harris Tyler, Whitten Keith
ICS Laboratories, 1072 Industrial Pkwy North, Brunswick, OH, 44212, USA.
University of Waterloo, School of Optometry and Vision Science, 200 University Avenue West, Waterloo, ON, N2L3G1, Canada.
Cont Lens Anterior Eye. 2021 Oct;44(5):101406. doi: 10.1016/j.clae.2021.01.001. Epub 2021 Jan 15.
This study evaluates the spectral transmission of photochromic contact lenses.
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.
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).
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.
本研究评估光致变色隐形眼镜的光谱透射率。
开发了一种定制的光致变色滤光片透射率测试装置（ICS光致变色试验台），以测量光自适应滤光片的光谱透射率。使用ICS光致变色试验台在23℃和35℃下，于0秒、45秒、90秒和15分钟时测量七种隐形眼镜在暴露（变黑）状态下的光谱特性，以及在45秒、15分钟和20分钟时测量其未暴露（褪色）状态下的光谱特性。采用混合重复测量方差分析（MRM-ANOVAs）和广义相加模型（GAMs）来比较温度和阳光照射时间对光致变色隐形眼镜光谱透射率的影响。
光致变色隐形眼镜在暴露状态下，23℃时0秒、45秒、90秒和15分钟的平均（±标准差）透射率分别为94.7±0.2、39.1±1.4、27.0±0.7和14.7±1.0，35℃时分别为93.7±0.9、38.8±2.4、30.2±1.8和26.1±1.0。光致变色隐形眼镜在未暴露状态下，23℃时45秒、15分钟和20分钟的平均（±标准差）透射率分别为18.3±1.5、71.3±2.4和80.2±2.4，35℃时分别为39.1±1.0、90.6±1.0和91.1±0.9。随着阳光照射时间增加，光透射率显著降低（GAM，MRM-方差分析，p<0.05）。温度和阳光照射时间对光致变色隐形眼镜有显著影响（GAM，MRM-方差分析，p<0.05）。光致变色隐形眼镜透射光的差异出现在90秒和15分钟时（Tukey HSD，90秒和15分钟时，p<0.05），此时35℃的隐形眼镜比23℃的隐形眼镜显示出更高的光透射率。基于隐形眼镜的温度，光谱透射率存在差异。在所有未暴露时间，35℃的隐形眼镜比23℃的隐形眼镜透射更多的光（MRM-方差分析，p<0.05）。
使用ICS光致变色试验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，温度越高，光透射率越高。
