Slit lamp photo; broad illumination. Early epithelial stage of infection. Linear configuration resembles the epithelial form (dendritic) of herpes simplex keratitis. (Photo courtesy of Dan B. Jones, M.D. )

Left, broad illumination; right, slit beam illumination. Early epithelial stage. Multifocal intraepithelial Acanthamoeba organisms. (Photo courtesy of Dan B. Jones, M.D. )

Left, broad illumination; right, slit beam illumination. Early epithelial stage. (Photo courtesy of Dan B. Jones, M.D. )

Broad illumination. Perineuritis. Inflammatory cell recruitment around corneal nerves. (Photo courtesy of Kirk R. Wilhelmus, M.D. )

Left, broad illumination; right, slit beam illumination. Early, central stromal inflammation (keratitis); resembles the immunogenic form of herpes simplex stromal keratitis. (Photo courtesy of Dan B. Jones, M.D. )

Left, broad illumination: right, high magnified slit illumination. Early phase of ring infiltrate. (Photo courtesy of Dan B. Jones, M.D. )

Left, broad illumination; right, slit illumination. Ring infiltrate. (Photo courtesy of Dan B. Jones, M.D. )

Left, broad illumination with slit beam; right, high magnified slit beam. Typical advanced ring infiltrate. (Photo courtesy of Dan B. Jones, M.D. )

Broad illumination. Nodular scleritis, superonasal quadrant adjacent to the limbus in advanced keratitis (may be sterile or contain Acanthamoeba organisms). (Photo courtesy of Dan B. Jones, M.D. )