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design otdivided the lens to two parts. The one part of glasses is a kind of membran that have glass degree.the other part is thin light weight .and non-degree lens , this part play the supportives role.when we have increased the degree of myopia but didnt increase the degree of the membrane lens, so in this way ,we can make it need less require of frequent changes of glasses. And conserve resources ,we can also put a protective membrane on glasses ,