A corneal ulcer is an open sore on the surface of the cornea, the clear front part of the eye. It can result from infections, injuries, or underlying conditions like dry eye or contact lens misuse. Symptoms often include redness, pain, blurred vision, and increased sensitivity to light. If left untreated, a corneal ulcer can lead to serious complications, including vision loss. Treatment typically involves antibiotic or antifungal medications, depending on the cause. In severe cases, surgical intervention may be necessary to repair the cornea and restore vision. Regular eye care can help prevent corneal ulcers.