Treatments for erectile dysfunction such as Viagra do not appear to pose long-term damage to men's vision, according to research findings published in the latest edition of the Archives of Ophthalmology.
Medics have expressed concerns in the past that Viagra might prove harmful after some men reported blurred and blue-tinged vision.
A total of 244 healthy men, some with erectile dysfunction, aged 30-65 took part in the study which was funded by Eli Lilly, manufacturers of Cialis, Viagra's competitor which is sold in the US. Some took 5mg of Cialis daily, 77 took 50mg of Viagra and 82 were given a placebo.
Among the 194 men who completed the study and eye examinations no significant differences were found in vision between those taking the drugs and the placebo groups, according to researchers.
'Our results indicate that there is no cumulative damage or effect of clinical significance for either 5mg of Cialis or 50mg of Viagra taken daily for six months,' the report authors noted.