Infrared radiation is an electromagnetic radiation with wavelength from 1–2 mm to 0,74 µm. It occurs when working with liquid metal or glass near hot furnaces, and during industrial processes involving electric arc or associated with objects heating.
Very strong infrared radiation in high heat zones can cause conjunctiva drying up. The most dangerous situation is when radiation is not accompanied by a visible light. To protect against infrared radiation it is necessary to use a special shield or goggles.
Almost all the materials for glass and plastic lenses block ultraviolet radiation less than 300 nm and infrared radiation with wave length over 3,000 nm (3). Goggles and safety shields used to protect eyes from infrared radiation, are of a greenish shade, dark or light depending on operation-demanded dim out degree.
Peripheral vision protection is of primary importance for this type of safety eyewear and industrial sunglasses. Side shields or «a head-wrap» design of protective equipment are essential for protection against focusing of temporal and oblique rays in the nasal equator of crystalline lens where the cortical cataract often originate.