http://articles.mercola.com/sites/articles/archive/2006/02/04/harming-your-eyesight-with-viagra.aspxA study suggests that impotency drugs such as Viagra and Cialis may be linked with an increased risk of optic nerve damage in men with a history of heart attack or high blood pressure. NAION The findings are based on examinations of about 80 men. HalfenCommunityServer 2008.5 SP1 (Build: 31106.3070)