Calcific band keratopathy (BK) is a corneal degeneration that is characterized by deposition of calcium within the superficial cornea, mainly within Bowman's layer. BK usually begins as fine, yellow-white deposits in the periphery that may coalesce over time to form a horizontal band across the cornea. This photograph shows BK in a patient with HLA-B27-associated uveitis. The "Swiss cheese" appearance derives from lucent "holes" in the calcific pattern due to corneal nerve penetration through Bowman's layer.
Ophthalmic Atlas Images by EyeRounds.org, The University of Iowa are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.