“…In one study, the incidence and prevalence of episcleritis was 41 per 100,000 person-years and 53 per 100,000 persons; for scleritis, the incidence was 3 per 100,000 person-years and 5 per 100,000 persons, respectively. 15 About 25% to 35% of patients with episcleritis or scleritis have an associated systemic disease. 16 …”