Xanthopsia is a visual disturbance characterized by excessive perception of yellow colors (literally "yellow vision"). It may be associated with use of various drugs including digoxin (especially if levels are toxic), thiazides (especially chlorothiazide), sulphonamides, and barbiturates. The mechanism is uncertain, but one possibility is that this is a partial form of achromatopsia, affecting one color more than others.
It has been suggested that the artist Vincent van Gogh (1853-1890) may have suffered from xanthopsia as a consequence of digitalis toxicity, accounting for the bright yellows in many of his later canvases.
Critchley M. Acquired anomalies of color perception of central origin. Brain 1965; 88: 711-724