Anti blue light glasses, anti blue light standard

There are two standards for calculating the blue light blocking rate, the ISO International Organization for Standardization standard and the EN European Union standard. The blue light blocking rate values calculated by the two calculation methods are different. The ISO standard has added two variables: blue light hazard coefficient and blue light distribution in the environment.
Anti blue light EN blocking rate algorithm [9]
Anti blue light ISO blocking rate algorithm [9]
τ λ -- The sample is at a wavelength of λ Spectral projection ratio at time
λ -- The solar spectral power distribution at sea level with an air quality of 2;
B λ -- Blue light hazard coefficient;
λ --λ It is a complete weighting function that is numerically equal to λ And B λ Product of