研究者发现，这些廉价墨镜在透光性上做得十分低劣，因光线透过劣质镜片而光线发生折射，容易造成视觉重影、甚至还有头疼眩晕的迹象。
Present in some prescription glasses, it has the effect of bending light and can cause double vision or headaches in some wearers.
他摘下眼镜，这时记者才留意到，这种眼镜的镜片呈灰黑色，戴上去的感觉，比墨镜更黑。
He took off his glasses, this reporter noticed, this lens grayish black, wear to the feeling, more than sunglasses black.
他摘下眼镜，这时记者才留意到，这种眼镜的镜片呈灰黑色，戴上去的感觉，比墨镜更黑。
He took off his glasses, this reporter noticed, this lens grayish black, wear to the feeling, more than sunglasses black.
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