Ratio of the luminous flux transmitted by the lens or filter to the incident luminous flux where T (l) is the spectral transmittance of tinted spectacle lens; V (l) is the spectral luminous efficiency function for daylight (see ISO/CIE10527); SD65l(l) is the spectral distribution of radiation of CIE standard illuminant D65 (see ISO/CIE 10526). NOTE: The spectral values of the product of the spectral radiation distributions SD65l(l) of the illuminant and the eye's spectral luminous efficiency function V (l) are given in table A.2.
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