Yes. Viagra may be linked to vision problems, including blindness. Viagra may cause changes in visions, such as blurred vision, difficulty distinguishing between blue and green colors, or noticing a blue tinge to objects. According to some reports, some men have reported suffering form partial loss of eyesight after taking Viagra. Vision loss allegedly associated with Viagra is believed to be caused by blood flow being blocked to the optic nerve. This condition is known as non-arteritic anterior ischemic optic neuropathy, commonly referred to as NAION. This condition, which reports indicate is the most common cause of sudden vision loss in older Americans, leads to swelling around the optic disc. The optic disc is a connection point where the optic nerves reach the back of the eye. Vision loss may occur if the swelling that occurs compresses the optic nerves.