13 Causes of Red Eye

13. Scleritis

Scleritis is inflammation of the sclera—or the white part of the eye. Usually, scleritis is associated with an underlying autoimmune disorder, like rheumatoid arthritis but can also be caused by trauma to the eye, and rarely by a fungus or parasite. Symptoms of scleritis include redness, blurred vision, tearing, sensitivity to light, severe pain, and tenderness of the eye. Sometimes, the pain can extend to the jaw, face, or head on the side of the affected eye. Left untreated, scleritis can result in loss of vision or blindness. Treatment will vary based on the severity of the condition but may include corticosteroid pills and anti-inflammatory drugs as well as eye drops and antibiotics.