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  • Title: Toward the design of an optimal filter for enhancement of dichromat monocular chromatic discrimination.
    Author: Richer SP, Adams AJ, Little AC.
    Journal: Am J Optom Physiol Opt; 1985 Feb; 62(2):105-10. PubMed ID: 3872597.
    Abstract:
    Based on Farnsworth's theories of color confusion and discrimination, "rose-colored" or "pink" filters such as the X-Chrom material of 0.16 mm in thickness or the Kodak Wratten no. 30 filter act as monocular chromatic enhancers for red/green color deficients by virtue of colorimetrically lengthening color space in a direction perpendicular to the dichromatic axis of color confusion. Using derived formulas for dichromat colorimetry, a set of representative isoluminant-isochroma spectral hues, and interactive computer graphic colorimetric tools, it is possible to determine an optimum spectrophotometric filter curve. Such a filter has minimal middle wavelength transmission and is optimal in terms of providing maximal monocular chromatic clues for discriminative tasks involving confused colors.
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