A number of conditions can cause an object to appear bluish in color (cyanopsia).
Causes of cyanoopsia:
(1) drugs including methylene blue, oral contraceptives, other estrogen/progesterone compound, sildenafil citrate, digoxin, amphetamine, chloroquine or related compound and deslanoside.
(2) pseudophakia
(3) tertiary syphilis (with optic atrophy)
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