We often see the news about the damage to our eyes, as well as the news related to the news. So in the end how the unit will cause defamation ofour eyes? What is it outside us to imitate the knowledge. The next Laser safety glasses technology, laser goggles operators take you to understand.
A laser on the eye, slander
The laser with long and eye slander: laser characteristics of monochromatic, strong antijamming, low energy, spot can shoot a few kilometers but not scattered. In the laser slander, slander to organism eyes the most significant. In the span of the visible and nearinfrared laser refractive medium attracting rate is low, high transmittance, and the refractive focusing power (i.e. poly strong power). Through the eye refractive medium high intensity visible or near infrared light into the eyes, light on the retina to accumulate. At this point on the retina laser energy density and power density spread to thousands of the very many times, a large number of light in an instant polyomentum on heat induced retinal photoreceptor cell layer increased rapidly, andeven the photoreceptor cell degeneration and necrosis and lose sensitive coagulation effect.
Protein coagulation degeneration gathered in the photoreceptor cells generated when the laser is not to overheat and cause irreversible damage. Once the damage to the current will cause the eye forever blind. The laser phase effect against eye span level instead, its antecedents are contrary. The harm to the eyes of the far infrared laser to the cornea, so this is the span of the laser is almost every corneal attraction, so the most important causeof corneal damage, keratitis and conjunctivitis, patient advocates eye pain, foreign body stimulation, be afraid of light, like a runny nose, Black Pearl hyperemia, eyesight rise etc.. Produce far infrared damage should cover the cover eye injury, prevent contamination, to solve the disease. UV laser eye damage is the cornea and lens, the UV laser band almost every by the lens of the eye to attract, COSCO to corneal attraction, therefore can be crystalline and corneal opacity.
Two. The relationship between the intensity of the laser beam and the damage of the eye
The level of laser damage to the eye is related to the total light energy, energy density and power density of the laser beam, unless it is independent of the laser beam in the opposite span. Visible or near infrared laser power density is very low, does not lead to the eye of the chronic harm.Retinal damage is in power, time, such as when the power density of visibleor near infrared laser has been gradually increased, the heat induced retinal progressivity is greater than the cooling schedule, or power density is notvery high, but the time is too long to attract the omentum, omentum bear flowparts of the heat will increase the photon, which shines more time long, thetemperature increases, the temperature is greater than above, abnormal eye temperature of 10 C, will lead to retinal damage.
Three, in the eyes of the laser incident point.
Laser safety glasses Because of special anatomical and physiological relationship of extraordinary black eyes, has a close relationship with the incidentlaser damage to the retina, eye view. The cause is the black eye is a condensing lens system, laser beams and optic axis plane into the eye, to placethe macular recess focus into very small spot, its energy density ratio at 3~4 times of cornea. Where is the macular area and visual acuity of the concave eyes performance and the least area, once the damaged visual performance will have the opposite level change. Significant persons will be blind for a lifetime. Therefore, the visual damage caused by laser photons, causing photoreceptor degeneration necrosis, resulting in damage to the inverse. In the daytime, the color vision of the human eye is completely lost by the photosensitive action of the macular area, while the area of the macular area is only a small part of the total retinal area, and the diameter of the local areais only about 0.5mm. But a reflection of the line of sight (the total area of the eye that can be seen behind the eyes) is a big contrast. There are2~ 30 thousand long and thin cone photoreceptor cells in the local area of the physiological structure, and the density of the sensitive cells is very high, and the visual performance is very important. After damage to the night color visual performance on the loss. Furthermore, the local macular recess without blood vessels and nerves are scattered, and the heat release performanceof this site is very bad, once the damage after the repair is expected areblind. Place concave is the center of the most abundant in the retina, afterbeing subjected to the laser action to be more easily thanthe rest part of the retina damage, so the laser direct eye is very strangeinsurance. When thelaser axis view incident slightly deviated from the eyes, focus not fall on the macular region, and falls in the outer layer of the retina. The oppositeof the incident, the damage is not the same, and even the eye into direct energy when completely opposite but to slander is much lighter. The cause is part of the outside macular photoreceptor cells thanthe macular area spread toless density, and macular outside the unit area of retinal thickness, subjected to the opposite energy, the temperature level is much smaller. In addition,the macular area outside the retina is densely covered with micro blood vessels, lymph cycle can take away all the heat,so thatthe heat may be reduced. Heat increases, the more severe damage; conversely, the lower the level ofheat, the more likely the damage. The importanteffect of laser on the acute damage of retina is the result of thermal effect. Theincident angle of the laseraxis and not deviate from the view synchronization, greater omentum lesions more light, iris can block the deviationanddoes notenter the fundus laser. Because the local concave maculararea invisual performance in the role very insignificant, and the parts are the mosteasily damaged,so the direct laser beam oddrisk levels than fromapoint of viewinto the eyes of Los