What are the hazards of laser to the human body, and what are the effects of laser on the human body

Lasers are harmful to the eyes.

Laser wavelength and eye damage: Among the laser injuries, the eye damage in the body is the most serious. For lasers with wavelengths in visible and near-infrared light, the ocular refractive medium has a low absorption rate and high transmittance, while the refractive medium has a strong focusing ability (i.e., light gathering power).

When high-intensity visible or near-infrared light enters the eye, it can pass through the refractive medium of the human eye and accumulate light on the retina. At this time, the energy density and power density of the laser on the retina increase to thousands or even tens of thousands of times, and a large amount of light energy is instantly concentrated on the retina, causing the temperature of the photoreceptor cell layer of the retina to rise rapidly, so that the photoreceptor cells coagulate, degenerate and necrosis and lose the photosensitive effect.

Protein coagulation and degeneration caused by overheating when the laser is concentrated on photoreceptor cells is irreversible damage. Once damaged, it can lead to permanent blindness of the eye.

The damage of laser to the human body is mainly the eyes, followed by **.

1) Damage to the eyes and vision Lasers can burn biological tissues, especially the retina.

burns are the most common. Because of the laser beam.

It can focus a very small spot on the retina through the eye's own refractive system, so that the light energy is highly concentrated, resulting in burns. Laser radiation in the infrared or microwave region can be absorbed by the iris or crystals, causing thermal damage, resulting in iritis.

and cataracts. The damage of laser to the eye is related to factors such as tone wavelength, pulse width, gap time, beam energy, angle of incidence, and irradiated tissue characteristics. After the glasses are irradiated with laser, they may suddenly have a sense of glare, blurred vision or a fixed black shadow in front of the eyes, and even loss of vision.

The damage of laser radiation to the retina is the most important and easy to be ignored. Long-term frequent exposure to small doses and diffuse reflexes.

With laser irradiation, the staff generally does not notice the impairment of their vision, and sometimes they have a general neurasthenia.

After work, there are no specific symptoms, such as eye fatigue and eye pain. Except for the permanent loss of vision in a few individuals, most of the accidental injuries to the eyes by laser have varying degrees of recovery after **.

2) Injury to ** The damage process of laser to ** is manifested as mild erythema, burning until tissue charring necrosis, in addition to damage pigment cells, causing capillary plugging, sometimes blood vessel rupture and hemorrhage. **Damage is usually reversible and reversible. The most important way to prevent laser hazards is safety education, strictly prohibit naked-eye laser beams, and pay attention to operating procedures.

Determine the operation area and danger zone and have eye-catching warning signs, irrelevant personnel are not allowed to enter at will, wear appropriate protective glasses, protective gloves, and regularly check the body, especially the eyes.

If the laser is strong enough, it can burn the human body.

Laser pollution is also a special form of light pollution. Because the laser has the characteristics of good directionality, energy concentration, pure color, etc., and the light intensity when the laser reaches the fundus can increase by hundreds to tens of thousands of times after the laser passes through the focusing effect of the lens of the human eye, the laser has a greater damage effect on the human eye. A portion of the laser spectrum is in the ultraviolet and infrared ranges and can harm the conjunctiva, iris, and lens of the eye.

Powerful lasers can harm the deep tissues and nervous system of the human body. In recent years, lasers have been widely used in medicine, biology, environmental monitoring, physics, chemistry, astronomy, and industry, and laser pollution has attracted more and more attention.