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据说眼镜大约同时在中国和欧洲出现,眼镜的功能是提高视力或矫正视力的缺陷。眼镜片主要是由加工磨制的凸透镜和凹透镜来担当,中央比边缘薄的是凹透镜,用来纠正近视;中央比边缘厚的是凸透镜,用来纠正远视。17世纪荷兰制造眼镜的技术已经很精湛了,主要的工艺是磨制凸透镜和凹透
It is said that glasses appeared in China and Europe at about the same time, the function of glasses is to improve vision or correct vision defects. Eye lenses are mainly processed by the processing of convex lens and concave lens to play the central thinner than the edge of the lens is concave, used to correct myopia; the central thick than the edge of the lens is used to correct myopia. The technique of making glasses in the 17th century in the Netherlands is already exquisite, the main process is the grinding of convex lenses and concave