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The most common cause is digoxin toxicity and the development of cataracts which can cause a yellow filtering effect. It has been suggested that Digitalis-derived digoxin, used to treat heart failure, induced xanthopsia responsible for the yellow tinting exhibited by many of Van Gogh's works. — “Xanthopsia - Wikipedia, the free encyclopedia”, en.wikipedia.org
In the second para of "Adverse Effects" section, visual disturbances (yellow-green halos) are listed under "common (>=1%)". However in the final (one line) para xanthopsia (yellow-green vision) is listed as rare. I agree with above re:xanthopsia being quite rare. As I understand, the occulotoxicity of. — “Talk:Digoxin - Wikipedia, the free encyclopedia”, en.wikipedia.org
Nearly every formulary and herbal which lists santonin or santonin-containing plants lists the real risk of yellow vision and of fatal reactions; even small doses of santonin cause disturbances of vision, usually yellow vision or perhaps green (xanthopsia or chromatopsia). — “Santonin - Wikipedia, the free encyclopedia”, en.wikipedia.org