镜片应是光学玻璃制造的,光学玻璃具有折射率稳定、均匀性好、透光率高等优点。如果是窗玻璃等劣质材料制成的,则从侧面看多发绿色。目前市场上一些价格低廉的老花镜,多数是用窗玻璃制成的。有关人士提醒消费者,应这样鉴别眼镜片质量。双手持镜架,置于眼前,将镜片凸面向外,上下缓慢移动,从镜片内观察远处物体。如果大部分物体静止不动,但局部有波纹状的跳动现象,则说明镜片表面不平。 The lens should be made of optical glass, optical glass has the advantages of stable refractive index, good uniformity, high light transmittance. If it is made of poor quality materials such as window glass, the appearance of multiple green from the side. Currently on the market some inexpensive reading glasses, mostly made of window glass. Concerned people to remind consumers, should identify the quality of optical lenses. Hold the frame with both hands, placed in front of the lens convex outward, slowly move up and down, from the lens to observe objects in the distance. If most of the objects still, but the local beating ripples, then the lens surface uneven.