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Pellucid marginal degeneration types5/3/2023 Patients with either sign should be considered pellucid suspects and poor candidates for refractive surgery, Dr. The presence of "crab claw" topography will indicate pellucid, but in early cases what will more likely be seen is inferior flattening characterized by an isolated inferior blue spot. However, since the cornea typically gets thicker from the center to the periphery, clinicians should be suspicious if there is little difference between the central and inferior pachymetry. Pellucid marginal degeneration (PMD) of the cornea is a progressive, rare, and uncommon noninflammatory corneal disorder characterized by the thinning in the peripheral portion of the inferior cornea with marked steepening just superior to the thinned zone. Patients may appear clinically normal and have normal pachymetry, if it is performed centrally or paracentrally. The key to recognizing early cases of pellucid is topography, Dr. By Keratoconus Type Corneal Hydrops Forme Fruste Keratoconus Posterior Keratoconus Keratoglobus Pellucid Marginal Degeneration. Pellucid corneas involve a larger distorted geographic area usually extending from the. Another difference between pellucid marginal degeneration and keratoconus is that the onset of pellucid tends to be in the 30s, rather than around the time of puberty. Pellucid Marginal Degeneration is a sub-category of keratoconus. In pellucid marginal degeneration, corneal thinning typically occurs from the 4 to the 8 o'clock position approximately 1 mm from the inferior limbus. Rabinowitz, MD, director of ophthalmology research, Cedars Sinai Medical Center, Los Angeles. A 54-years-old man, a known case of oculocutaneous albinism (OCA) type 1, presented to us with gradual-onset diminution of vision both eyes (OU) for 5 years. Although it is atypical and rare, clinicians should learn how to identify pellucid and screen patients for it preoperatively, said Yaron S. Pellucid marginal degeneration is a subtle condition that could lead to corneal ectasia following laser eye surgery. Corneal degenerations encompass a large category of corneal disease, which includes such more common processes as keratoconus, pellucid marginal degeneration.
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