The cornea is the clear, dome-shaped surface covering the front of the eye. This outermost layer can blister with tiny raised lesions. Blisters on the cornea can be painful but will usually heal within a week.
According to Wrong Diagnosis, six medical conditions can cause cornea blisters. A foreign body in the cornea, a scrape or injury to the cornea, hard contact lenses, dry eye and Keratitis. Keratitis is inflammation of the cornea, most frequently caused by syphilis.
Symptoms of cornea blisters include sensitivity to light, eye pain, blurred vision, redness in the eye, watery eye, scratchy eye and difficulty opening the eye. An additional symptom of Keratitis is a yellow discharge from the eye.
A physician will be able to diagnosis the cause and proper treatment for cornea blisters. Treatment options may include lubricants, ointments or eye drops. Wearing an eye patch will reduce the pain and allow the cornea to heal. A prescription of antibiotics can prevent a serious infection. Resting with the eyes shut will reduce painful movement, and wearing sunglasses outside will keep the bright light from hurting the eye.