I can't find my little blue pills! I can't find my little blue pills! I can find *that* but beyond that I can't find - anything at all!
The condition, known as nonarteritic anterior ischemic optic neuropathy (NAION), causes a rapid reduction of vision and can, in the most serious cases, lead to blindness.
Report co-author Dr Howard Pomeranz said the drug had long been linked to sight problems.
"For years, we have known some men who take Viagra will experience temporary colour changes in their vision and see things as blue or green.
"NAION is a much more serious condition because it can lead to permanent vision loss."
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