Infrared night vision is a photomultiplier tube imaging, and telescopes with the principle of the whole is different, can not be used in the daytime, the price is expensive and need a power supply to work. Ultraviolet damage to the human body in the hot summer, the sunlight contains ultraviolet radiation on the human body is difficult to avoid. Excessive exposure to ultraviolet light from the sun can cause damage to the human skin, eyes, and immune system. Ultraviolet rays can destroy human skin cells, resulting in wrinkles, pigmentation, aging of the skin before age, and in severe cases, producing solar dermatitis and sunburn, or solar keratosis of the skin and mucous membranes, causing cancer. Eyes are sensitive organs of ultraviolet rays, ultraviolet rays can cause damage to the lens, is one of the causative factors of senile cataract. In the blazing summer, 10 a.m. to 3 p.m., the sun's ultraviolet intensity is the strongest, outdoor activities should be avoided during this time to avoid ultraviolet damage to the human body, even if you need to be outdoors during this time, do not forget to support the sun umbrella, wear a sun hat or sun glasses, the use of formal manufacturers of skin care and sunscreen, and try to white or light-colored clothes to reduce ultraviolet irradiation, causing unnecessary damage to the human body. The human body to reduce the exposure to ultraviolet rays, causing unnecessary damage. Although excessive ultraviolet radiation causes harm to the human body, but the human body can not grow up without ultraviolet radiation. The 7-dehydrocholesterol in the skin is converted into vitamin D3 by light irradiation, and vitamin D3 has an important physiological function in maintaining the concentration of calcium ions inside and outside the cells of the body and in regulating calcium and phosphorus metabolism. In countries with insufficient sunshine, rickets in infants and young children and the onset of adult osteomalacia and osteoporosis more than the infant's thriving away from the right amount of sunbathing, the human body needs the right amount of ultraviolet rays, therefore, the right amount of light is still necessary. The most important thing to remember is that you can't avoid the sun's rays, but you can't avoid the sun's rays, and you can't avoid the sun's rays. Excessive exposure to ultraviolet light from the sun can cause damage to the human skin, eyes, and immune system. Ultraviolet rays can destroy human skin cells, resulting in wrinkles, pigmentation, making the skin age before it gets old, and in severe cases, producing solar dermatitis and sunburn, or solar keratosis of the skin and mucous membranes, causing cancer. Eyes are sensitive organs of ultraviolet rays, ultraviolet rays can cause damage to the lens, is one of the causative factors of senile cataract. In the blazing summer, 10 a.m. to 3 p.m., the sun's ultraviolet intensity is the strongest, outdoor activities should be avoided during this time to avoid ultraviolet damage to the human body, even if you need to be outdoors during this time, do not forget to support the sun umbrella, wear a sun hat or sun glasses, the use of formal manufacturers of skin care and sunscreen, and try to white or light-colored clothes to reduce ultraviolet irradiation, causing unnecessary damage to the human body. The human body to reduce the exposure to ultraviolet rays, causing unnecessary damage. Although excessive ultraviolet radiation causes harm to the human body, but the human body can not grow up without ultraviolet radiation. The 7-dehydrocholesterol in the skin is converted into vitamin D3 by light irradiation, and vitamin D3 has an important physiological function in maintaining the concentration of calcium ions inside and outside the cells of the body and in regulating calcium and phosphorus metabolism. In countries with insufficient sunshine, rickets in infants and young children and adult osteomalacia and osteoporosis of the onset of more than infants can not thrive without an appropriate amount of sunbathing, the human body needs an appropriate amount of ultraviolet light, therefore, an appropriate amount of light is still necessary. Infrared (Infrared rays) is one of the many invisible rays of the sun's rays, discovered by the German scientist H?sschel in 1800, also known as infrared thermal radiation (Infrared radiation). The wavelength of infrared radiation on the solar spectrum is larger than that of visible light, with a wavelength of 0.75 to 1,000 μm. Infrared radiation can be divided into three parts, i.e., near-infrared radiation with a wavelength of 0.75 to 1.50 μm; mid-infrared radiation with a wavelength of 1.50 to 6.0 μm; and far-infrared radiation with a wavelength of 6.0 to l,000 μm. In recent years, due to the improvement of testing equipment and in-depth research, people have a more comprehensive understanding of the physical properties of infrared radiation and its biological effects, and many advances have been made. Infrared rays, especially far-infrared rays, have been widely used in the healthcare industry, and a large number of infrared products related to daily life have also appeared. This paper introduces the biological effect mechanism of infrared rays and the current status of its clinical application. First, the mechanism of infrared biological effect Infrared is a kind of electromagnetic wave, when it radiates to the object through the radiation mode, the radiation energy absorbed by the object is transmitted to the object of atoms, molecules and other particles, so that these particles undergo irregular movement, causing the object's warming effect, known as the far infrared ray effect, also known as the warming effect. Produce a primary effect at the same time, the object also occurs with other chemical, physical and other changes, which is called the object absorbs far-infrared radiation after the secondary effect, also known as the secondary effect. Infrared radiation on human skin, subcutaneous tissue has a strong penetrating power. The primary effect of external infrared radiation on the human body can increase the temperature of the skin and subcutaneous tissue accordingly, promote blood circulation and metabolism, and promote human health[1] . Infrared physiotherapy on the tissue thermal effect, anti-inflammatory effect and promote regenerative effect has been clinically recognized, usually the treatment are used on the lesion site direct irradiation. Near-infrared micro-irradiation therapy has a significant effect on the improvement of microcirculation, especially on the improvement of micro-blood flow. The performance of the irradiation of capillary blood flow speed up, the phenomenon of red blood cell aggregation is reduced, the phenomenon of subpapillary venous plexus stasis is reduced or disappeared, so as to improve the body's tissues, the important organs of nutrition, metabolism, repair and function has a positive effect.!!!!