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The total fraction or percentage of incident electromagnetic radiation (including Ultraviolet, Visible, and Infrared light) that is absorbed by a material, as opposed to being reflected or transmitted.
read more about total absorptance ...In non-reflective optics, Total Absorptance is calculated as $1 - ext{Total Transmittance}$. A material with $10\%$ transmittance has $90\%$ total absorptance.
Protective spectacle lenses must have high absorptance for harmful radiation (especially UV) and moderate, comfortable absorptance for visible light (tint) while maintaining high transmittance for non-absorbed visible light.
High total absorptance, especially in the infrared (heat) range, means the lens will absorb more heat, which can be an issue for extreme environments.
No. UV absorptance is a function of the lens material's chemical structure, not the visible light tint. A clear lens can have $100\%$ UV absorptance and $0\%$ visible light absorptance.
Specialized coatings or lens materials are needed to effectively absorb or reflect infrared (heat) radiation.
Ocular safety requires $100\%$ absorptance in the UV range (less than $400 ext{ nm}$), regardless of visible light absorptance.