Pfizer: No proof Viagra causes blindness

Global pharmaceutical company Pfizer said a review concluded Viagra did not increase patients’ risk of blindness, but that it was still working with US federal regulators to update the drug’s label to reflect rare reports of vision-loss.

Last month, the US Food and Drug Administration said it had 38 reports of blindness caused by a a condition called NAION or non-arteritic anterior ischemic optic neuropathy among users of Viagra.