Relative visual field defects are associated with an apparent desaturation of colors. A simple confrontation test comparing the subjective hue and saturation of a luminous test object in equally eccentric parts of the central visual field has been correlated with kinetic, achromatic perimetry in 46 cases of relative field defects.
There were five false-negative results in perimetry and two in confrontation. The two tests were equivalent in 39 cases. Seventy cases without evidence of visual pathway disturbances were found normal in both tests. The color saturation confrontation test (CSCT) is considered useful in screening for disturbances of the visual pathways.
Frisén L. A Versatile Color Confrontation Test for the Central Visual FieldA Comparison With Quantitative Perimetry. Arch Ophthalmol. 1973;89(1):3-9. doi:10.1001/archopht.1973.01000040005002