Cyanopsia

A cause of blue-yellow CVD, simply described as a bluing of the vision. This constitutes a Tetartan defect, albeit non-congenital. The biggest causes are drug toxicity (e.g. Sildenafil, AKA Viagra), or as the result of cataract removal, since natural lenses are slightly yellow-tinted and artificial lenses are not.

See also Xanthopsia.

Claude Monet’s paintings showed the likely effects of Cyanopsia after receiving cataract surgery.