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Glass of Easy-Clean can be cleaned on its frame. Between the frame there is a layer of cloth. When you push up the lens, fibers in the frame would clean it. Nearsighted person wears the glasses all the day without carrying the box and cleaning cloth, and it is a trouble that people should take off the glasses then clear them, so Easy-Clean would be convinient for them.
Shudan Lin Jiang Wu Ningning Zhu Su Yang