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People who wears glasses feel comfortable because they have to take off glasses when they take a shower or play in swimming pool. If they put on glasses, they would forget them. They can't know where they are because of their poor eyesight. In addition, it is possible to sink in the swimming pool. Therefore, it is difficult to find them. Because it is like common glasses as usual, thus design can prevent rejection of users. Also, it can ease anxiety of loss because the frames of glasses can be changed into tubes.