1.A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set.
1.一种防治近视眼理疗器,它有作为物、筒、目,还有头套和,它用于人们在近距离上长时间用眼时戴在眼上,可以使被视物像清楚、放大和变远。
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1.Bigger scopes are good for fainter objects, but are more expensive, and can be difficult to set up and use.
大的镜测暗的物体较有利,不过它贵,而且难安装与使用。
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