A number of conditions may be associated with a bilateral transient loss or darkening of vision.
Related to decreased perfusion:
(1) systemic hypotension
(2) postural hypotension
(3) heart failure
(4) vasomotor collapse with fainting
(5) severe carotid stenosis (associated with postprandial transient visual loss)
(2) severe hunger
(3) vitamin deficiency
(4) transurethral resection of prostate (TURP) if glycine is used as the irrigating fluid (resulting in elevated serum glycine concentration)
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