Correction filter for correcting color vision characteristic and color vision testing method

Abstract

A correction filter is a correction filter configured to change a spectrum of transmitted light, and change a spectrum of light in a wavelength band including at least one of a peak absorption wavelength λL at which an absorption spectrum of L cone cells of a human peaks and a peak absorption wavelength λM at which an absorption spectrum of M cone cells of the human peaks. When changing a spectrum of light in a wavelength band including λL, transmittance increases as a wavelength goes from a wavelength XC between λL and λM toward a wavelength XL longer than λL. When changing a spectrum of light in a wavelength band including λM, transmittance increases as a wavelength goes from the wavelength XC toward a wavelength XS2 shorter than λM.

Dependencies are inferred from the claim text.