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In the beauty field, the use of LED skin care is more common, such as 630nm red light,465nm blue light,590nm yellow light and 850nm infrared light. Wang xiuli, Department of Light Medical Treatment, Shanghai Dermatological Hospital, had made a skin test in 14 patients with photoaging. She irradiates the patient's skin with 530nm,630nm and 850nm LED light therapy respectively,3 times a week and 12 times in total. After treatment, the effects of LED light therapy on skin aging can be judged by observing the water content of the skin's stratum corneum, the brightness of the skin's color, the appearance, color of the photoaged skin and the effects on the collagen fibers and elastic...