Light reduction of up to 97.5% is possible if an Umbra coating is applied to both the front and back surfaces. With a light reduction of >92%, the lenses are no longer suitable for use in traffic!
Umbra is a high quality absorption coating with light reduction levels of 25, 75 or 85%, applied to one side of glass lenses in a vacuum deposition process.
The attractive brown tint guarantees the natural rendition of all colours. The vacuum deposition process results in a uniform tint over the entire lens surface, regardless of the dioptric power. The lenses with light reduction levels of 75% and 85% shield the eyes against strong glare and provide reliable protection against solar UV radiation.