配戴舒服，外观较为美观 变色镜片(Photochromic lenses) 这是一种暴露在太阳紫外光下时会变成深色的镜片，而不在阳光下会恢复原有透光率而变得透明。
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... pewter石墨色 photochromic lenses 变色镜片儿 photochromic progressive additional lens光学变色逐渐进展镜片儿 ...
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Not for photochromic lenses 不适合变色镜片
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These days, as Leight points out, you can buy photochromic lenses, which have some degree of protection but allow people to actually see your eyes (think Jack Nicholson).
WSJ: Tina Gaudoin on Style: You've Been Framed | How to Wear Glasses
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