The boundary value corneal ulcer - a disease more common in old age due to malnutrition of the cornea, lacrimal fluid discharge violations, and other not yet entirely understandable reasons.
The boundary value corneal ulcer occurs at the edge of the cornea in place of its conversion into the sclera (the limb). Usually first appears several small infiltrates, then they become a little sore, a diameter of about 1 mm. An ulcer is not growing, but there may be a long time, gradually turning into a corneal opacity or a small scar.
Treatment of marginal corneal ulcers is trying to improve nutrition and to remove the eye infection in conjunctival sac, if it is there.