Classification of protective glasses

Ordinary optical glass mirrors are made of ordinary optical glass to prevent mechanical damage to lathes, grinders, millers, drillers, borers, riveters, sand cleaners, and sculptors, as well as acid and alkali operations, testing, and sampling. Burns, and prevent foreign objects from entering the eyes of drivers and surgeons.
Sun-shading glasses, also known as sunglasses, have a visible light transmittance of about 20%, and absorb ultraviolet and infrared rays well. There are light green, light gray, light tea and other colors, used to make sun-shading and snow work protective glasses. Among them, light gray lenses have the least effect on color recognition; light tea glasses make the blue sky look darker and reduce the transmission of green light; light green lenses reduce the transmission of red light.
The colorants used in the lenses of gas welding goggles are mainly iron oxide, cobalt oxide, etc., which are yellow-green in color and can absorb all light waves with wavelengths below 500 urn. The visible light transmittance is below 1%, and only a small amount of infrared rays can pass through. This kind of glasses is specially used for welding in gas welding operation.

The ultraviolet rays generated by the electric welding of goggles for electric welding can cause damage to the cornea and conjunctiva tissues (28nm light is the most serious) when the eyeball is irradiated for a short time. The strong infrared rays produced can easily cause opacity of the eye lens. The welding goggles can block the above infrared and ultraviolet rays very well. This lens is based on optical glass, using iron oxide, cobalt oxide, chromium oxide and other colorants, and a certain amount of cerium oxide is added to increase the absorption of ultraviolet rays. The appearance is green or yellow-green. It can block all ultraviolet rays, the infrared transmittance is less than 5%, and the visible light transmittance is about 0.1%.
The protective glasses of the anti-solids category are mainly used to prevent mechanical damage to the eyes such as metal or sand and gravel debris. The spectacle lenses and spectacle frames should be strong in structure and resistant to shocks. There should be venting holes around the frame. Protective lenses can be tempered glass, glue-bonded glass or copper wire mesh protective glasses.

Protective glasses against chemical solutions. Chemical eye damage refers to the acid-base liquid or corrosive smoke entering the eyes during the production process, which will cause corneal burns, such as using sodium hydroxide, operating calcium oxide tanks, and transporting corrosive liquids. Or gas pipelines, cyanide or nitrite splashes during metal quenching, etc. Protective glasses against chemical solutions are mainly used to protect the eyes from chemical damage caused by irritating or corrosive solutions. Ordinary flat lenses can be used, and the frame should be covered to prevent the solution from splashing. Usually used in laboratories, hospitals and other places, general medical glasses can be used universally.

The anti-ultraviolet mirror melts ultraviolet absorbing chemicals into the optical glass, which has a high absorption rate of visible light and ultraviolet rays. According to the needs of different types of work, the lenses are respectively installed on the frame, mask or helmet. There are welding mirrors made of liquid crystals, which can turn black in 0.001~0.002s in case of strong light, which protects welding operators from electro-optic ophthalmia.

The high temperature resistant protective glasses lens is made of high temperature resistant glass, which can absorb some infrared rays, and is used for furnace front workers, furnace workers, blacksmiths, fire watchers, casters, glass workers, etc. in smelting operations.
Radiation protective glasses are made by adding lead to the optical glass, which is used for x-ray, gamma-ray, alpha-ray, and beta-ray workers.

Microwave protective glasses Microwave is an electromagnetic wave with a wavelength of about 1nm-1M. It can also cause harm to people, especially eyes. Under the action of strong microwaves, it can cause eye fatigue, dry eyes and dizziness, and can even cause lens opacity, cataracts and retinal damage. The damage of microwave to human eyes is mainly due to the heat effect that causes the lens to become cloudy, leading to the occurrence of "cataracts". There are many applications of lasers in industry, medical treatment, and scientific research. If the laser is projected on the retina, it can cause burns. Lasers larger than 0.1mW can cause bleeding, protein coagulation, melting, and permanent blindness. Its protection is to spray tin tetrachloride on the surface of the lens and a metal compound that can improve conductivity. It is to add a very thin layer of stannous metal powder on the outer surface of the optical glass to form a multilayer conductive film on the surface of the lens. To the role of shielding microwave. Because the microwave can bypass the lens and enter the eye, the frame of the lens should also be shielded to prevent the damage to the eye caused by the microwave.
The anti-laser lens is to prevent the radiation of the laser to the glasses. The shape is goggles. The lens must be equipped with a closed or semi-closed frame to prevent the laser from bypassing the lens and entering the eye. The lens is mostly made of polymer synthetic materials and can be replaced. . According to the principle of anti-laser radiation, anti-laser glasses are divided into reflection type, absorption type, reflection absorption type, explosive type, photochemical reaction type and color-changing glass-ceramic type, etc., which can be used as protective glasses for laser operators. The requirements for lenses are very high, such as the choice of light source, attenuation rate, light response time, optical density, light transmission effect, etc., different nanometer (nm) lasers require lenses of different wavelength bands.