The light emitted by the laser is divided into ultraviolet (100nm to 400nm), visible light (400nm to 780nm), and infrared (780nm to 100μm) depending on the emission wavelength. Generally speaking, the shorter the wavelength, the larger the optical quantum energy, the stronger the biological effect; and the pulse laser is more harmful than the continuous laser. Eyes and skin are the main human organs damage from the laser.
Ultraviolet light with a wavelength of less than 295nm can be almost completely absorbed by the cornea, damaging epithelial cells and causing keratitis and conjunctivitis; ultraviolet rays with a wavelength of 300nm to 400nm are absorbed by the lens to cause cataract; viscera can pass through the cornea and lens. Reach the retina. The laser power of visible wavelengths such as red, green, blue and purple will usually reach 5mW. Directly viewing this beam for a few seconds will cause some damage to the retina.
The different wavelengths of the laser have different effects on the eyeball, and the consequences are different. Far-infrared laser will hurt the cornea. 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, Afraid of light, tears, eye congestion, decreased vision, etc.
Laser therapy belongs to phototherapy technology in physical therapy.
The most widely used cardiovascular departments are laser surgery and He-Ne laser intravascular irradiation. Laser revascularization for heart disease and plaque embolism, including coronary atherosclerotic occlusion, had also been successful.
The laser therapy device laser source is low-intensity monochromatic red laser with a wavelength of 650nm and an output of 1-5mW. The low-intensity laser is a safe and reliable light source that is widely used in the medical field. In general, a safe laser is harmless as long as it does not illuminate the eye. Only the high-energy laser may cause burns due to its energy.
Low-energy lasers with a wavelength of 650 nm are most easily absorbed by red blood cells in human blood. The human body can absorb laser energy to produce lipoprotein lyase to reduce fat in the blood to improve microcirculation, improve the ability of red blood cells to carry oxygen, purify blood, lower blood viscosity, and reduce hyperlipidemia, hyperglycemia, and hypertension. Improve insulin function, make insulin secretion to normal levels, and get better treatment results.