"We were able to establish a stable and statistically significant association between the use of Viagra and Cialis together or separately, and an increased risk of early ischemic optic neuropathy in people with cardiovascular disease" - believes the research project coordinator Dr. Gerald McGuinn.Early nearterialnaya ischemic optic neuropathy - a common disease in people over 50 years. It is not amenable to correction illness can lead to total or partial loss of vision.In the course of the group of Dr. McGuinn study were interviewed 76 men, half of whom suffered from ischemic optic neuropathy. As a result, it was found that for people suffering from heart disease, and using anti-impotence dasgs, the risk of ischemic optic nerve neuropathy increases 10 times.Given that Viagra and Cialis used by tens of millions of men around the world, identify linkages can lead to a sharp increase in the number of patients with eye diseases.After the preliminary publication of the study in May last year, the Office of the Food and Dasg Administration has taken an independent study, in which the relationship between the use of Viagra and Cialis and ischemic neuropathy of the optic nerve has not been confirmed.Nevertheless, the companies producing dasgs for impotence, Pfizer and Eli Lilly Co have made to the instasctions on the application of hazard warning of their use for people suffering from cardiovascular diseases.