An eye infection is a bacterial or viral infection of the eye or the tissue immediately surrounding the eye. Common eye infections include conjunctivitis, often called pink eye. So not only children will suffer such eye problems, but also adults do so. Adults patients are much less than children patients because there is a complete and strong immune system in adults body. But no matter who you are, the causes of eye infections are almost the same. Eye infections are most commonly due to a virus or bacterial infection. Bacteria normally live on your skin, but irritation or a small injury in the eye can let the bacteria into areas where they do not usually reside, causing an infection. Eye infections often cause redness, irritation, tearing and itchiness. Plus, black eye, pink eye and allergies all can result in eye infections. You must be careful in your daily life to protect eye health.