Xanthopsia refers to the predominance of yellow in vision due to a yellowing of the optic media of the eye. The most common cause is digoxin's inhibitory action on the Sodium pump, and the development of cataracts which can cause a yellow filtering effect.
See also 
- Weatherall, D. J.; Ledingham, J. G. G.; Warrell, D. A. (1996). Oxford Textbook of Medicine. 3rd ed. Oxford: Oxford University Press. 2055.
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