Protective glasses are an important part of personal protective equipment. They can be divided into ordinary protective glasses and special protective glasses according to their functions.
Protective glasses is a special type of glasses designed to prevent radiation, chemical, mechanical and different wavelengths of light damage.
There are many types of protective glasses, and glasses with different needs for different occasions are different. Common examples include dust-proof glasses, impact-resistant glasses, chemical-resistant glasses, and radiation-resistant glasses.
Protection Goggle – classification
Ordinary optical glass mirror
Lenses made of ordinary optical glass to prevent mechanical damage to turners, millers, millers, drillers, borers, riveters, sanders, stylistes, acid and alkali operations, laboratory tests, sampling acid and alkali burns, and driving Prevent personnel, surgeons, and other foreign objects from entering the eyes.
Also known as sunglasses, the transmittance of visible light is about 20%, and it absorbs ultraviolet and infrared light better. There are many colors such as light green, light gray, light tea, etc., which are used to make sun protection and snow work protective glasses. Among them, light gray lenses have the least impact on color recognition; light tea glasses make the blue sky look darker and reduce green light transmission; light green lenses reduce red light transmission.
Gas welding goggles
The coloring agent used in this lens is mainly iron oxide, cobalt oxide, etc., which is yellow-green, can absorb light waves with a wavelength of less than 500urn, the visible light transmittance is less than 1%, and only a small amount of infrared rays can pass through. These glasses are intended for use during gas welding operations.
The short-term exposure of the ultraviolet rays generated by electric welding to the eyeball will cause damage to the cornea and conjunctival tissue (28nm light is the most serious). The intense infrared light generated can easily cause cloudiness of the eye lens. Welding goggles can block the above infrared and ultraviolet rays well. This lens is based on optical glass and uses coloring agents such as iron oxide, cobalt oxide, and chromium oxide, and a certain amount of cerium oxide is added to increase the absorption of ultraviolet light. Appearance is green or yellow-green. Can block all ultraviolet rays, infrared transmittance <5%, visible light transmittance is about 0.1%.
Protective glasses against solid debris
It is mainly used to prevent mechanical damage to the eyes such as metal or sand debris. Spectacle lenses and frames should be strong and resistant to shock. Covering edges are provided around the frame, and there should be ventilation holes. Protective lenses can be made of tempered glass, glued glass or copper wire mesh protective glasses.
Protective glasses against chemical solutions
Chemical eye injury refers to the entry of acidic and alkaline liquids or corrosive fumes into the eyes during the production process, which can cause corneal burns. When the metal is quenched, cyanide or nitrite splashes. Chemical-resistant protective glasses are mainly used to protect the eyes from chemical damage caused by irritating or corrosive solutions. Ordinary flat lens can be used. 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.
UV protection mirror
Chemicals that absorb ultraviolet rays are melted into optical glass, and have a high absorption rate for visible light and ultraviolet rays. According to the needs of different types of work, the lenses are respectively mounted on the frame, mask or helmet. Welding mirrors made of liquid crystal are available, which can turn black instantly from 0.001 to 0.002s in case of strong light, protecting welding operators from electro-optic ophthalmitis.
High temperature resistant goggles
The lens is made of high temperature resistant glass, which can absorb part of the infrared rays. It is used by furnace workers, furnace workers, forgeers, fire watchers, casters, glass workers, etc. for smelting operations.
X-ray protective glasses
It is used to add lead to optical glass for X-ray, gamma-ray, alpha-ray, beta-ray operators.
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 microwave, it can cause eye fatigue, dry eyes and dizziness, and even cause cloudiness, cataract and retinal damage. The harm of microwave to the human eye is mainly caused by the turbidity of crystals caused by thermal effects, leading to the occurrence of “cataracts”. There are many applications of lasers in industrial, medical, and scientific research. If the laser is projected on the retina, it can cause burns. Lasers larger than 0.1 mW can cause eyeball bleeding, protein coagulation, melting, and permanent blindness. Its protection is to spray tin tetrachloride on the lens surface and metal compounds that can increase the conductivity. It is to add a thin layer of tin oxide metal powder on the outer surface of optical glass to form a multilayer conductive film on the lens surface. To the effect of shielding the microwave. Because the microwave can bypass the lens and enter the eye, the frame should also be shielded to prevent microwave damage to the eye.
It can prevent the radiation of laser to glasses. The shape is goggle type. The lens must be equipped with a closed or semi-closed frame to prevent the laser from passing around the lens and entering the eye. The lenses are mostly made of polymer synthetic materials and can be replaced. According to the principle of laser radiation protection, laser protection glasses are divided into reflection type, absorption type, reflection absorption type, explosion type, photochemical reaction type, and color-changing glass-ceramic type, which can be used as protective glasses for laser operators. High requirements are placed on lenses, such as the choice of light source, attenuation rate, light response time, optical density, and light transmission effect. Different nanometer (nm) lasers require lenses in different wavelength bands.
Protection Goggle – Precautions
The goggles to be used should be products that have passed the inspection of the product inspection agency.
The width and size of the goggles should fit the user’s face shape.
Take off the lens with both hands, and handle it gently. If the glasses are temporarily placed, the lens will be placed with the convex side facing the lens.
When not wearing glasses, please use glasses cloth to put them in the glasses case, and avoid contact with corrosives such as insect repellent, toilet products, cosmetics, hair gel, medicine, etc., otherwise it will cause lens, frame deterioration, deterioration, Discoloration.
If the lens is worn, rough, worn, deformed, damaged, loosened, and the lens is easily loosened, the frame is loose or uncomfortable, and it should be adjusted in time. If the above-mentioned phenomenon occurs, the nose or ears will be burdened when the frame is deformed, which will affect the vision of the wearer. It should be replaced in time. It is recommended to regularly visit a professional store for plastic adjustment.
Coated lenses have high definition, and should not be in contact with organic solvents, oils, sweat, high temperatures, chemicals, and hard objects, otherwise the lens layer will be easily damaged, affecting clarity and aesthetics.
It is recommended not to use lenses that have scratches, stains, cracks, etc. Otherwise, it will cause unclear sight due to scattered light and cause vision loss.
Please do not leave it at high temperature (above 60 ℃) for a long time. The high temperature may easily cause lens deformation or cracks on the surface layer. Do not place it in direct sunlight or high temperature places such as the front window of the cab to avoid damage to the lens.
Metal frames should avoid contact with chemicals to prevent the coating from falling off and discoloring.
Prevent heavy falls and heavy pressure, and prevent hard objects from rubbing against lenses and masks.
Use a clean special lens cleaning cloth. Be sure to hold the wire on the side of the lens frame with your hand and gently wipe the lens. Avoid excessive damage to the frame or lens.
Dry cleaning is easy to wear on the lens. It is recommended to rinse with water and then use a paper towel to absorb the moisture and then wipe it with a special glasses cloth. When the lens is dirty, it is recommended to wash it with a low-concentration neutral lotion, and then rinse it with water and dry it.
When the lens is attached with sweat, juice, hair spray (gel), cosmetics, etc., please wash it with water immediately and dry it. If it is allowed to dry naturally, the scale will become stained and difficult to wipe clean and unclear.
When the lens is exposed to rain or sweat, wipe it off immediately with a lens cloth in one direction.
Wear progressive multifocal lenses, try not to use the edge of the lens to see things, because there is a sense of distortion and blur, look at the lower part of the lens close, the adaptation method is also indoor and outdoor.
The filters and protective sheets of the welding goggles should be selected and replaced according to the requirements of the specified operation.
Because of the prism of the lens, please drive and operate only when you are completely accustomed to wearing glasses to see things. It is difficult to grasp the sense of distance when you have just purchased glasses. Do not drive and operate until you are completely used to it.
Resin lenses may be broken due to strong impact, which may easily cause eye and face damage. It is not recommended to use it during strenuous exercise.
Do not look directly into the sun or strong light, otherwise you may hurt your eyes.
The goggles should be used by someone to prevent eye diseases.