In recent years, China’s laser industry has developed rapidly, the application market has gradually expanded, and many problems have been broken, a number of core technologies have been unlocked, and gradually get rid of the predicament of being “stuck” by foreign countries. With the rapid development of laser industry, more and more people begin to pay attention to the research and development, production and application of laser. Among them, “What does laser do to the human body?
The effects of laser on human body mainly include damage to the eyes and damage to the skin.
Damage to human skin Because of its physiological structure, human skin can form a complete protective layer, which can play a certain protective role in daily life. When the power of the laser is too large to shine on the skin, it will cause skin tissue damage. Although this damage can be repaired by the skin tissue itself, the protective function of the repaired skin tissue is reduced. The degree of laser damage to the skin is mainly affected by the amount of laser exposure, laser wavelength, skin color and tissue moisture. A large number of experiments have proved that the laser power density is positively correlated with the degree of skin tissue damage when the laser irradiates the skin. There is a certain safety threshold for the absorption of laser energy by human skin. When the safety threshold is exceeded, the human skin (the part irradiated by laser) will appear erythematous, blistering, carbonization, boiling, burning or even vaporization due to the increase of laser irradiation. It is not difficult to know that laser damage to human skin mainly because of laser thermal effect.
Although the damage caused by laser irradiation on human skin is not enough to affect the overall functional structure of skin tissue, it is still necessary to strengthen the protection of human skin during daily teaching and use, and wear protective clothing as required to minimize the damage of laser on human skin.
Damage to eyes When laser damage to the human body, it is the most serious damage to the eyes. The human eye is an approximately spherical body consisting of the wall of the eye, the contents of the eyeball, and the retina. The cornea and sclera, iris and choroid, retina three different texture of the wall of the eye. Ocular contents include crystal, aqueous humor and vitreous body. The eyeball’s refractive system consists of both the cornea and the contents of the eye, and because of its transparency, light is not hindered when passing through. The cornea, iris, crystal, vitreous body and aqueous humor together constitute the human body receives light precision optical system. The refractive system has the characteristics of low absorptivity, high transmittance and strong focusing ability, which enables the laser to pass through the refractive system to the retina when entering the eye. At this time, the laser energy density on the retina can be increased by thousands or even tens of thousands of times. The excessive temperature of the retina will lead to the necrosis of the photoreceptor cells, resulting in irreversible damage and even permanent blindness. The damage of far infrared laser to the eye is mainly aimed at the cornea, while the ultraviolet laser is mainly absorbed by the crystal. Corneal injury, can cause keratitis and conjunctivitis, the injured will also be accompanied by fear of light, tears, vision loss, congestion and other symptoms. When a crystal is damaged, it will appear cloudy.
Since the damage to the eyeball caused by laser irradiation is irreversible, we should attach great importance to the protection of the eyes, wear goggles, maintain a certain safe distance, and strictly abide by the relevant rules and regulations, so as to fundamentally avoid the occurrence of injury. Before using the laser for operation, check whether there is light leakage, and seal the position where light leakage is possible; The working environment should keep sufficient lighting, and protective structures made of light-absorbing materials should be selected around; Individuals should check the safety goggles and protective uniforms before working with lasers. To sum up, laser can cause serious harm to human body, but to a large extent we can avoid through scientific normative means.
Post time: Mar-16-2023