To avoid damage to eyes caused by radiant light, an effective and commonly used method is to wear protective glasses. The so-called protective glasses are a kind of filter, which can change the transmitted light intensity and spectrum. Different colors of protective lenses can absorb light of different colors. Now I will introduce some main types of goggles.
This type of glasses is common, because its transmittance of visible light is about 20%, and it absorbs ultraviolet and infrared rays better. There are a variety of colors such as light green, light gray, and light tea, among which light gray lenses have little effect on color recognition; light tea glasses make the blue sky look darker and reduce the transmission of green light; light green lenses transmit the red light cut back.
2 Goggles for gas welding
The colorants used in this lens are mainly iron oxide, cobalt oxide, etc., which are yellowish green and can absorb light waves of wavelengths below 500urn. The transmittance of visible light is below 1%, and only a small amount of infrared light can pass. This type of glasses is intended for use in gas welding operations.
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3. Goggles for welding
The ultraviolet rays generated by electric welding will cause damage to the cornea and conjunctival tissues in a short period of time when the eyeball is irradiated. (The strong infrared rays generated easily cause opacity of the eye lens. This lens is based on optical glass and uses iron oxide, cobalt oxide and oxidation Chromium and other colorants are added with a certain amount of cerium oxide to increase the absorption of ultraviolet rays. The appearance is green or yellow-green. It can block all ultraviolet rays, infrared transmittance <5%, visible light transmittance is about 0.1%.
4. Blue goggles
There are two kinds of this kind of glasses, one is colored by iron oxide and cobalt oxide, and the filament is purple-red when viewed with it, and the other is colored by copper oxide and manganese oxide, and the filament is white when viewed by it. They can all absorb the dazzling glare in the 500-600nm (visible light sensitive area of ??human eyes) wave band, the light transmittance at 400nm is below 12%, and also have a certain absorption effect on ultraviolet rays, suitable for operation in front of various industrial high-temperature furnaces Staff wear.
5. Crimson glass glasses
This spectacle lens is a dark red glass colored with cadmium sulfide and cadmium sulfide selenide, which can absorb all light in the wavelength band below 600nM. Can be used as goggles for medical or industrial personnel when operating X-ray fluoroscopy equipment.
6. Laser protective glasses
There are two forms of this kind of glasses, reflective and absorptive. The former uses a vacuum coating method to coat a layer of metal film. The reflectivity of the laser bands at wavelengths of 532nm, 694nm and 1060nm is greater than 99.5%; The laser band can be fully absorbed. The lens must be equipped with a closed or semi-closed frame to prevent the laser from bypassing the lens and entering the eye. Can be used as protective glasses for laser operators.
7. Microwave protective glasses
Microwave is an electromagnetic wave with a wavelength of about 1nm-lM, it can also cause harm to people, especially the eyes. If it is under the action of strong microwaves, it can cause eye fatigue, dry eyes and dizziness. It can even cause crystal opacity, cataracts and retinal damage. Its protection is to spray tin tetrachloride and metal compounds that can improve conductivity on the surface of the lens to form a multi-layer conductive film on the surface of the lens, which plays a role in shielding the microwave. Because microwave energy bypasses the lens and enters the eye, the frame should also be shielded to prevent microwave damage to the eye.