The application of laser in medicine has been expanded, and the field of application is expanding. If the safety of laser protection is not paid attention to during the application process, it may cause accidental injury. Accidents that have occurred in clinical applications have been reported. Safety protection must be carried out while fully utilizing and using the laser.
The damage of the laser on the eyes
Laser wavelength and eye damage: In the damage of the laser, the damage to the eyes in the body is the most serious. A laser having a wavelength of visible light and near-infrared light has a low absorption rate of an ocular refractive medium and a high transmittance, and a refractive power of a refractive medium (ie, a condensing power) is strong. High-intensity visible or near-infrared light can diffuse through the human eye and accumulate light on the retina. At this time, the laser energy density and power density on the retina increase to several thousand or even tens of thousands of times. A large amount of light energy is instantaneously concentrated on the retina, causing the temperature of the photoreceptor layer of the retina to rise rapidly, so that the photoreceptor cells are coagulated and degenerated. And lose the role of sensitization. Protein coagulation and degeneration caused by overheating of laser light when it is concentrated on photoreceptor cells is irreversible damage. Once damaged, it will cause permanent blindness of the eyes.
The different wavelengths of the laser have different effects on the eyeball, and the consequences are different. The damage of the far-infrared laser to the eye is mainly caused by the cornea. This is because the laser of this wavelength is almost completely absorbed by the cornea, so the corneal damage is the heaviest, mainly causing keratitis and conjunctivitis. The patient feels eye pain, foreign body-like stimulation, Afraid of light, tears, eye congestion, decreased vision, etc. When the far-infrared light damage occurs, it should cover the injured eye to prevent infection and symptomatic treatment.
The damage of the ultraviolet laser to the eye is mainly the cornea and the lens. The ultraviolet laser in this band is almost completely absorbed by the lens of the eye, while the COSCO is mainly absorbed by the cornea, which can cause opacity of the lens and cornea.