An optical filter with a spectral transmittance curve that is close to the limit of standard spectral luminosity stipulated by the International Commission on Illumination.
By using a correction filter that approximates the light sensitivity to the light curve, it is incorporated into a device that measures transmittance at values close to those perceived by the human eye.

Visibility is the intensity of light perceived by the human eye. Since the perceived intensity differs for each wavelength, it is widely used in fields such as sensitivity correction, color correction of light emitters, and luminance measurement equipment.
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