FIG. 3.

(Left) Recurrent toxoplasmosis around the periphery of an old scar, which is the white central disc. (photo courtesy of F. G. LaPiana.) (Middle left) Corneal scraping stained with Masson trichrome stain demonstrating a polygonal cyst of Acanthamoeba (arrow). (Middle right) Dendritiform epithelial lesions of the lower part of the cornea demonstrated by fluorescein staining in a patient with Acanthamoeba keratitis. (Right) Gram stain of a conjunctival scraping from a patient with microsporidial keratoconjunctivitis demonstrating large gram-positive ovoid microorganisms within conjunctival epithelial cells. (The last three panels reprinted from reference 137a with permission from the publisher.)