The luminescence spectrum of xenon lamp source used in the laboratory is continuous spectrum, and the luminous band mainly focuses on 320 nm~1000 nm. As can be seen from Figure 1, The harmful light to the human eye mainly includes ultraviolet light with wavelength between 320 nm and 400 nm, blue light with wavelength between 400 nm and 500 nm and infrared light with wavelength greater than 780 nm.
Figure 1. Luminescence spectra of xenon lamp source
The human eye has two natural lines of defense: the cornea and the lens. The cornea is located in the front of the eyeball, which is the first line of defense of the eyeball. The lens is behind the cornea. The cornea and lens absorb ultraviolet light, leaving visible and infrared light to the retina for imaging. The cornea and lens work hard as a barrier to absorb UV rays, but they also bear the risk of disease and need to be protected.
Strong light protection in laboratory - UV light hazard
Ultraviolet light of 320 nm~400 nm will cause damage and necrosis of corneal conjunctival epithelial cells, resulting in ultraviolet acute keratoconjunctivitis, and even cataract. At the same time, ultraviolet light will lead to the combination of phosphorus ions in the lens and calcium ions in the aging lens, so that the eyes appear calcification or hardening of the phenomenon, lens protein degeneration and turbidity, so that the original ability to transmit light through the visible lens decreased, so that the vision decreased.
Bright light protection in laboratory - Blue light hazard
Blue light in visible light refers to the light with wavelength between 400 and 500 nm. Blue light has the highest photon energy in visible light and can penetrate through the lens to the retina, causing atrophy and even death of retinal pigment epithelial cells. The death of light sensitive cells will lead to vision loss or even complete loss. This damage is irreversible. The damage of retina caused by high intensity blue light is much greater than that caused by near infrared light. Blue light can also cause macular degeneration, a condition in which the lens of the human eye absorbs some of the blue light and becomes cloudy, forming cataracts.
Laboratory strong light protection - infrared light hazard
Greater than 780 nm wavelength infrared light damage eyes due to containing a large number of fluid in the eye, is the cause of these fluids of infrared absorption, can be converted into heat energy to make the temperature inside the lens, when the temperature inside the lens to beyond the limits of temperature must, will lead to a variety of proteins within the lens produces denaturation solidification, causing cataracts.
In order to reduce the harm of xenon lamp source in the laboratory to the eyes of the experiments. Perfectlight technology introduced Perfectlight technology light protection mirror, can effectively prevent strong light, ultraviolet light on the eyes of the experiments.
Figure 2. Perfil Technology optical protection lens
Comparing the light protection effect of Perfectlight technology light protection goggles with ordinary sunglasses on the market,At the same irradiation distance, the spectral distribution and power density of xenon light source passing through Perfectlight Technology optical protection lens and ordinary sunglasses were measured respectively.
FIG. 3 comparison of protective effect between Perfectlight technology optical protection lens and ordinary sunglasses
As can be seen from Figure 3 (a), Perfectlight Technology optical protection lens has a full-spectrum protection effect on the light between 320 nm and 1000 nm, and the protection effect is significant.
As can be seen from Figure 3 (b), ordinary sunglasses can only protect ultraviolet light within 400 nm, and have no protective effect on blue and infrared light except weakening the light intensity.
As can be seen from the data in Table 1, the transmittance rate of Perfectlight technology optical protection lens is only 3%, with significant protective effect, while the transmittance rate of ordinary sunglasses is 40%-70%, without obvious anti-glare effect.
Table 1. Comparison of protection data between Perfectlight goggles and ordinary sunglasses
Perfectlight technology light protection mirror adopts soft leg adjustable design, no sense of pressure, comfortable to wear, suitable for different experiments. side indirect ventilation design, with good ventilation effect, forehead grinding treatment, prevent overhead strong light and reflection, and has good anti-strong light impact performance.