Xanthopsia

A cause of blue-yellow CVD, simply described as a yellowing of the vision. This constitutes a Tritan defect, albeit non-congenital. The biggest causes are drug toxicity (e.g. Digoxin, a heart medication), or age-related yellowing of the lens.

Many believe (speculatively) Vincent Van Gogh to have suffered from Xanthopsia, which influenced his work during the final four years of his life (Arnold 1991).

See also Cyanopsia.