A number of conditions can cause an object to appear reddish in color (erythropsia).
Causes of erythropsia:
(1) numerous drugs
(2) neurasthenia (hysteria)
(3) tertiary syphilis (with optic atrophy
(4) retinal or vitreous hemorrhag
(5) aphakia or pseudophakia
(6) snow blindness
(7) blindness after electric shock
(8) welding arc maculopathy
(9) after working with green monochrome video display terminals
