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Research Article: Application of a Revised Tissue Saving Protocol for Combined Topography-Guided Photorefractive Keratectomy and Cross-Linking in a Cohort Having Pellucid Marginal Degeneration

Date Published: 2024-02-01

Introduction:
Pellucid marginal degeneration (PMD) is an uncommon, progressive, non-inflammatory corneal ectatic disorder with thinning of the inferior cornea in a crescent-shaped pattern. The corneal ectatic transformation occurs concentric with the inferior limbus and is separated from it by a distance of – mm. Tissue loss and crescentic stromal thinning leads to flattening of the vertical meridian, with paradoxical steepening at the horizontal meridian resulting in high values of against-the-rule astigmatism.

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