The most common systemic association of scleritis is –: (A) Ehlers – Danlos syndrome, (B) Disseminated systemic sclerosis, (C) Rheumatiod arthritis, (D) Giant cell arteritis
Answer is C. "When a patient comes to an ophthalmologist with scleritis, RA must be considered, because it is the most common cause of scleritis (and episcleritis)".
— The cornea by Dohlman