Fig. 15. Episcleritis. In episcleritis, the vascular networks of the conjunctiva, episclera, and sclera are all congested. The edema is confined to the episcleral tissue so that the reflected light from the sclera shows no displacement. (Watson PG, Hayreh S, Awdry P: Episcleritis and scleritis. Br J Ophthalmol 52(3):278–279, 1968)