• Courtesy of Kenneth M. Goins, MD.
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    Cornea/External Disease

    Circumscribed posterior keratoconus. A, Scanning-slit corneal topography shows a nasally displaced anterior corneal apex (top left), temporal paracentral posterior corneal vaulting (top right), normal anterior keratometry reading (bottom left), and significant loss of stromal thickness (bottom right). B, A slit-lamp photograph shows loss of stromal thickness, stromal haze, and posterior corneal crater (arrow).