This part of ISO 8980 specifies requirements for the transmittance properties of uncut finished spectacle lenses and mounted pairs, including attenuation of solar radiation. This part of ISO 8980 is not applicable to — spectacle lenses having particular transmittance or absorption characteristics prescribed for medical reasons; — products where specific personal protective equipment transmittance standards apply; — products intended for direct observation of the sun, such as for solar-eclipse viewing. NOTE Optical and geometric requirements for uncut finished spectacle lenses are specified in ISO 8980-1 and ISO 8980-2, and for mounted lenses, in ISO 21987.