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The ratio of the total amount of solar radiation energy absorbed by a material's surface to the total amount of solar radiation incident upon that surface. It is the opposite of solar reflectivity.
read more about solar absorptivity ...In eyewear, the degree of solar absorptivity determines how dark the lens tint appears. Tints function by absorbing visible light energy.
A high solar absorptivity (e.g., a very dark lens) means the lens itself will absorb more heat energy from the sun, which can be felt by the wearer.
A protective lens should have a high absorptivity in the harmful UV range and sufficient absorptivity in the visible range to ensure comfortable vision.
A heat mirror coating is a low-emissivity coating that reflects the infrared (heat) portion of the solar spectrum while remaining clear to visible light.
It is measured as a dimensionless ratio between 0 and 1 (or 0% to 100%).
Yes. A clear plastic lens (polycarbonate or high-index) can intrinsically absorb 100% of UV light due to the chemical structure of the material.