Viagra, Cialis, and Levitra share similar mild side effects like upset stomach and headache. They also share similar serious, but rare, side effects like bluish vision, or at least some reports in the past have claimed this to be the case. According to a new study, vision was unaffected in men who took the erectile dysfunction drugs.

To examine the effect of ED drugs on vision, a study was conducted on a group of 244 men with erectile dysfunction. These men were healthy and had no vision problems. During the course of six months, the men were given comprehensive eye exams to monitor any vision changes in response to taking ED medication. The study concluded that no significant vision change was noted from taking the drugs.

The researchers who conducted this study acknowledge a shortcoming in their study – the dosage used in this study was lower than in studies where vision changes were recorded. It should also be noted that this was a company-funded study, so one can certainly question the importance, if any, this study has.