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Pellucid Marginal Degeneration (PMD)

Background

Pellucid marginal degeneration (PMD) is a bilateral, noninflammatory, peripheral corneal thinning disorder characterized by a peripheral band of thinning of the inferior cornea. The cornea in and adjacent to the thinned area is ectatic. Schalaeppi first coined the term pellucid marginal degeneration in 1957.

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