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This design is based on the principle of condensation. The heating bar heats the goggles to a temperature of 36℃ closed to the body temperature, and maintains a dynamic balance. Make the temperature of the goggles is higher than the internal air temperature. which can prevent water liquefaction, to prevent fogging. The color of the heating strip gradually changes from white to yellow as the temperature increases, and the color deepens to orange-red after exceeding the working time stipulated by the medical staff. It reminds the wearer to take a rest in time and not to be overworked.