The cornea is eye's transparent, protective outer layer. Corneal abrasion (ulcer) is an open sore on the cornea, usually caused by trauma, foreign object or self-injury and infected aftermath. It's a painful condition that causes tearing, squinting and sometimes vision loss. Diagnosis is made by direct observation and use of diagnostic fluorescein sodium sterile ophthalmic strips which form fluorescein stain that appears green under ophthalmoscope light. This method helps in defining the margins of the corneal ulcer and can reveal additional details of the surrounding epithelium. - Please help in treating the condition.