![]() ![]() ![]() 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. pellucid marginal degeneration (pmd) is a progressive corneal disease which is characterised by inferior peripheral corneal thinning. 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. Visual rehabilitation is usually possible with contact lenses, with surgical management required in selected cases. Slit-lamp examination is very useful to distinguish PMD from other corneal ectatic disorders with inflammatory nature. The topographic findings, of reduced power in the vertical meridian and superior loop cylinder, are typical of superior pellucid marginal degeneration. PMD usually starts later in life than keratoconus and progresses slower than keratoconus. It is a rare corneal disorder that shares many clinical characteristics with other corneal ectasias, such as keratoconus, keratoglobus or Terrien marginal degeneration. 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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