... Ultrasonic waves 3) 2 BIO waves 4) LCD screen led light therapy IntroductionPhototherapy has long history, the ancient Greek, ancient ... the first set of optical instrument, which is used to cure skin tuberculosis and the curative effect was salience. For this ... lot of lights of different wave-lengths, there are infrared light, visible light (imply red, orange, yellow, green, black, orchid, purple), ...