Ultraviolet radiation (ultraviolet light, UV) is an electromagnetic radiation in the range of visible radiation shortwave limit and X-ray radiation (10 — 380 Nm, 7,9·1014 — 3·1016 Hz).
Ultraviolet radiation is almost insensible for human eyes, but intensive irradiation usually causes radiation injury (ratinal burn). Soft ultraviolet (300–380 Nm) is perceived by the retina as light violet or gray-blue light, but is almost completely blocked by the eye-lens, especially of the middle-aged and elderly.
To protect the eyes against harmful effect of ultraviolet radiation, special safety goggles are used which entrap up to 100% of ultraviolet radiation and are transparent in the visible spectrum. Generally, the lenses of these goggles are made of special plastics or polycarbonate with special infused colorless additives.
Protection against UV is enhanced by the goggles design — clamming models — that blocks the rays passing not only through lenses but also directly to the eyes, past the goggles.