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It's often happened to the shortsighted people that glasses are always foggy in the winter so that prevent them from a clear sight. The upper edge of memory mask is introversion that can stop warm air rising. And the memory mask used polyether polyurethane, this kind of material have the feature of viscoelasticity, it can changed automatically as the shape of bridge of the nose changed, fitted tightly with nose and cheekbone, especially with the two sides of wing of nose. Without warm air there’ll not be fog on glasses, therefore people see more clearly in winter.
Jinyi Chen; Feng Chen; Yamin Tian；Lishan Feng;