Introduction. Pellucid marginal corneal degeneration. Pellucid marginal corneal degeneration is one of the non-inflammatory disorders that cause corneal ectasia. Pellucid marginal corneal degeneration differs from keratoconus in that the corneal protrusion occurs inferiorly, above a narrow band of clear, nonvascularized thinned corneal stroma that is concentric to the limbus. Both pellucid marginal corneal degeneration and keratoconus are considered to be contraindications of laser refractiv9448
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