Probe as Viagra use linked to blindness

US HEALTH officials are examining 38 reports of blindness among some men using Viagra.

However, the Food and Drug Administration has no evidence yet that the drug is to blame, said spokeswoman Susan Cruzan.

The type of blindness involved - NAION, or non-arteritic anterior ischemic optic neuropathy - can occur in men who are diabetic or have heart disease, the same conditions that can cause impotence and thus lead to Viagra use.