1. McGavin DD, Williamson J, Forrester JV, et al. Episcleritis and scleritis. A study of their clinical manifestations and association with rheumatoid arthritis. Br J Ophthalmol. 1976;60:192.
2. Foster CS, Forstot SL, Wilson LA. Mortality rate in rheumatoid arthritis patients developing necrotizing scleritis or peripheral ulcerative keratitis. Effects of systemic immunosuppression. Ophthalmology. 1984;91:1253.
3. Franklin Jr AN, William WB, Bruce SB, Stephen TH, Estelle F, Simons R, Robert F, Lemanske Jr. Albert & Jakobiec’s Principles & Practice of Ophthalmology, 3rd Edition Book Chapter 323. Adult Rheumatoid Arthritis: Saunders Publishing; 2008.
4. Lipsky PE. Rheumatoid Arthritis. In: Fauci AS, Kasper DL, Longo DL, editors. Harrison’s principles of internal medicine. 17th ed. New York: McGraw-Hill; 2008.
5. Matsuo T, Kono R, Matsuo N, et al. Incidence of ocular complications in rheumatoid arthritis and the relation of keratoconjuntivitis sicca with its systemic activity. Scand J Rheumatol. 1997;26:113–6.