Italian researchers seems to have found another positive health effect for coffee, according to this BBC News article.
The researchers found that drinking one to two cups of coffee protects against blepharospasm that could lead to blindness. Blepharospasm, a form of dystonia, causes sufferers to have uncontrollable twitching of the eyelid. In some extreme cases, it will cause the sufferers from being able to see.
Do read the article for more information.