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变色眼镜可以矫正各种屈光不正的眼睛,又可吸收阳光中的紫外线,作太阳镜来使用,能起到保护眼睛的作用,所以深受消费者的喜爱。怎样才能挑选出一副称心如意的变色眼镜呢? 一、变色要快,褪色也要快。变褪色速度是衡量变色眼镜质量优劣的主要指标。选购变色眼镜时,首先要检查眼镜片的变色速度。目前我国比较好的变色镜片,在紫外线(阳光)照射后,40秒钟就可完全变色;离开紫外线后,在正常温度下,两分钟内褪色可达到半透明的程度。完全褪色后,镜片表面无色透明,不留下任何色彩。
Color glasses can correct a variety of refractive errors in the eyes, but also absorb the sun’s ultraviolet rays, used as sunglasses, can play a role in protecting the eyes, so loved by consumers. How can we pick out a pair of pleasing color glasses it? First, the color change faster, faded faster. Fading speed is a measure of the quality of color change the main indicators of quality glasses. When purchasing discoloration glasses, we must first check the discoloration speed of the lens. At present, China’s better color lenses, in the ultraviolet (sunlight) irradiation, 40 seconds can be completely discolored; leave the UV, at normal temperature, fade within two minutes can reach the degree of translucency. Completely faded, the lens surface colorless and transparent, leaving no color.