What causes corneal abrasion and how can it be treated?

Trauma. Corneal abrasion is a loss of the skin on the surface of the cornea. It is very painful and usually the cause is obvious - a scrape to the eye from paper, a fingernail, a plant branch and objects flying into the eye. It is treated by protecting the eye with antibiotics, pain relief and allowing the new skin to grow in which happens usually in less than a day.