Types of glasses

1. Protective glasses against solid debris 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.
2. 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.
3. Radiation-proof protective glasses are used to protect the eyes from excessive ultraviolet rays and other radiation rays. The lens is made of special glass that can reflect or absorb radiation, but can transmit a certain amount of visible light. The lens is plated with bright chromium, nickel, mercury or silver metal film, which can reflect radiation; the blue lens absorbs infrared rays, the yellow-green lens absorbs both ultraviolet and infrared rays, and the colorless leaded lens absorbs X-rays and gamma rays. For example, common welding glasses require relatively low light transmittance of the lens, so the color of the lens is mostly ink; laser protective glasses, as the name suggests, can prevent laser radiation to the glasses, so the requirements for the lens are very high. For the selection of light source, attenuation rate, light response time, optical density, light transmission effect, etc., different nanometer (nm) lasers require lenses of different wavelengths.