Blue Cone Monochromacy

A rare form of colorblindness where the individual sees in Monochromacy (grayscale) because only one class of cone is present (S-cone). This disease is an intersection of Protanopia (missing the gene for the L-Opsin) and Deuteranopia (missing the gene for the M-Opsin).

Formerly referred to as Sex-linked Achromatopsia.