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Pellucid marginal degeneration
Pellucid marginal degeneration (PMD) is a rare, non-ulcerative thinning disorder involving the outer edge of the lower portion of the cornea. PMD causes a portion of the cornea to bulge forward, often first presenting as astigmatism. In contrast to keratoconus, where the greatest corneal protrusion is in the area of maximal thinning, the greatest corneal protrusion with PMD is above the area of maximal thinning.
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