春天到了，夏天还会远么？艳阳日请为眼睛准备一副舒适的偏振光太阳镜（polarized sunglass）。在2012年ARVO眼科学会议上，有一个墙报讲解（poster）非常有趣，是比较了偏振光太阳镜（polarized sunglass）和均色太阳镜(tinted sunglass)的视觉感受（Abstract585-C0196）。方法是通过量化眯眼的动作这一行为学手段来评估视觉清晰度。结果是偏振光眼镜舒服一点。科学量化比较难，但是自己戴戴感受很简单，我自己就有几副太阳镜，偏振光的就是舒服，看得清楚，不易疲劳。我强烈要求爸爸妈妈老公都戴偏振光太阳镜。我女儿只有9个月，出门的时候，太阳太烈只要我戴，我也就给宝宝戴上。我找了张我买的宝宝太阳镜图片，baby banz牌的。我得说明我买它是因为价格较低，而不是它最好。国内肯定有各种价格的宝宝太阳镜，第一选偏振光，第二爸爸妈妈试戴戴，舒服即可。

太阳镜不是耍酷的工具，是保护眼睛的必需品。50%的视觉损伤和失明来自于白内障（cataract），即晶状体浑浊。晶状体会吸收紫外线，过量长期吸收紫外线会导致白内障。

我的眼睛适合隐形眼镜，所以戴太阳镜很自然。似乎市场上没有近视、远视框架眼镜同时又是偏振光太阳镜，这时候，可以购买太阳镜夹片。这是一种带夹子的镜片，可以夹在框架眼镜上，外出就把偏振光镜片夹在镜片上。我找了张我老公买的这种太阳镜夹片。夹片翻下来的时候看不出来是眼镜再附加镜片，但是在室内他是把夹片拿下来的。在室内还翻起来他觉得挺囧。

Invest Ophthalmol Vis Sci 2013;54: E-Abstract 585.
© 2013 ARVO 

585—C0196

Novel method to objectively evaluate visual comfort during sunglass useGeorge Zikos¹, Samantha Slotnick¹, Rocco Robilotto¹, Arkady Selenow¹ and Steven Ali¹

¹ Institute for Vision Research, Manhattan Vision Associates, New York, NY

Commercial Relationships: George Zikos, Essilor USA (F); Samantha Slotnick, Optos, Inc. (F); Rocco Robilotto, Essilor (F); Arkady Selenow, None; Steven Ali, None

Support: None

Abstract

Purpose:Several studies connect visual comfort with squinting, and muscle tension (Nahar et al. 2007, Sheedy et al. 2005, Aaras et al. 2005). In a previous study we demonstrated that polarized lenses improve CSF and reaction times in a simulated driving environment (Zikos et al. 2009) We have further developed this method by adding simultaneous evaluation of pupil size and squint amount during either distance or a near task in the presence of glare, in order to further evaluate objectively different sunglass types.

Methods:Four subjects were tested during simulated outdoor distance and near activities: The distance task was similar to the 2009 investigation’s simulated driving environment (CSF and response times tested with Cambridge Research Systems Ltd. ViSaGe system). The near task included a reading task and FACT Near CSF in the presence of glare. A modified ISCAN eye movement system with IR cameras was used to track pupil and aperture size (squinting level) during testing. Three types of lenses were tested: polarized, tinted and clear.

Results:Both distance and near CSF results show increased contrast sensitivity when using polarized lenses vs. tinted or clear lenses. (mean increase 124% distance and 134% near). Pupil measurements were similar between the two sunglasses (Mean pupil size 4.2mm) Good correlation between measuring squint levels with ISCAN and photographically was found. Mean squint levels were 0.8mm less on average with the sunglasses.

Conclusions:The addition of measuring pupil size and squint levels may prove useful in objectively measuring comfort levels with different spectacle lenses.

Keywords: 718 spectacle lens • 754 visual acuity

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