Viagra, Cialis impotence drugs show no damage to eyes: study

The erection drugs can cause changes in light perception right away that clear a few hours later, said Raj Maturi, an author of the Lilly-funded research and an ophthalmologist at the Indiana University School of Medicine in Indianapolis.

The study, published online today in the Archives of Ophthalmology, found no evidence of permanent visual changes in patients who took the drugs every day for six months, Maturi said. About 6.2 percent of U.S. men are unable to achieve an erection, with rates rising to 16.7 percent in ages 60 to 69, according to the National Institutes of Health.

“The average patient should be relieved these drugs don't cause significant visual dysfunction,” Maturi said in a telephone interview today. “And he can be comfortable taking them in the long-term.”

The study was sponsored by Indianapolis-based Lilly, which also helped design the research, collect the data and prepare the manuscript. Viagra had sales of US$1.9 billion last year for Pfizer, based in New York. Cialis revenue was US$1.2 billion for Lilly.

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