An account of seven new cases of NAION in patients who had recently taken Viagra were published recently in the Journal of Neurological Ophthalmology, apparently kick-starting the current discussion.
An editorial in the same journal points out that some patients with impaired eyesight as a result of NAION have reportedly decided to sue Pfizer, the manufacturers of Viagra.
In a statement, the company said it was difficult to establish a firm link as most patients taking impotency drug had other risk factors which rendered them potentially vulnerable to NAION.