Some areas of AAO.org are temporarily unavailable. We apologize for the inconvenience and are working to restore access.

  • Courtesy of Robert S. Feder, MD.
    File Size: 688 KB
    Cornea/External Disease

    Power map shows the typical “crab claw” pattern seen in pellucid marginal degeneration, which can also be seen in keratoconus with inferior apical decentration.