In addition, biomechanical and densitometric properties have been studied as complementary techniques to help in the diagnosis of PMD.Ĭorneal topography Keratoconus Keratoglobus Mooren’s ulcer Pachymetry Pellucid marginal degeneration Terrien marginal degeneration.Ĭopyright © 2018 British Contact Lens Association. New Scheimpflug imaging-based devices have shown the importance and usefulness of the pachymetric map for an appropriate diagnosis of PMD. Corneal topographic indices and the classical crab-claw topographic pattern cannot be used as the main tool to distinguish between PMD and keratoconus. Slit-lamp examination is very useful to distinguish PMD from other corneal ectatic disorders with inflammatory nature. pellucid marginal degeneration (pmd) is a rare corneal ectatic disorder that is common in men in the fourth to fifth decade, which presents with bilateral and often asymmetrical peripheral corneal thinning in a crescentic manner with high against-the-rule astigmatism. PMD usually starts later in life than keratoconus and progresses slower than keratoconus. The procedure completely eliminated myopia of -8.00. RESULTS: Uncorrected visual acuity improved from 2/60 to 6/60 following the procedure. It is a rare corneal disorder that shares many clinical characteristics with other corneal ectasias, such as keratoconus, keratoglobus or Terrien marginal degeneration. METHODS: A 41-year-old man with pellucid marginal degeneration with poor visual acuity due to irregular astigmatism was treated with intacs microthin insert (KeraVision, Fremont, Calif) in the left eye. Pellucid marginal degeneration (PMD) is a non-inflammatory ectatic corneal disease characterized by a narrow band of corneal thinning separated from the limbus by a relatively uninvolved area 1-2 mm in width.
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