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English

(7) myopia: the lens becomes convex, shorter focal length, convergence enhancement, imaging in front of the retina, see Qingyuan matter, photopic distance is less than 25cm should be wearing a concave lens.

Chinese

(7)近视眼:晶状体变凸,焦距变短,会聚作用增强,成像在视网膜前,看不清远物,明视距离小于25cm,应戴凹透镜。