![]() ![]() The condition is rare, though the exact prevalence and incidence are unknown. The word "pellucid" means clear, indicating that the corneas retain clarity in pellucid marginal degeneration. The term "pellucid marginal degeneration" was first coined in 1957 by the ophthalmologist Schalaeppi. Surgery is reserved for individuals who do not tolerate contact lenses. Intacs implants, corneal collagen cross-linking, and corneal transplant surgery are additional options. Treatment usually consists of vision correction with eyeglasses or contact lenses. Corneal pachymetry may be useful in confirming the diagnosis. Pellucid marginal degeneration is diagnosed by corneal topography. The cause of the disease remains unclear. It is typically characterized by a clear, bilateral thinning ( ectasia) in the inferior and peripheral region of the cornea, although some cases affect only one eye. Rarely, it may cause acute vision loss with severe pain due to perforation of the cornea. It typically presents with painless vision loss affecting both eyes. Pellucid marginal degeneration ( PMD) is a degenerative corneal condition, often confused with keratoconus. Vision correction ( eyeglasses or contact lenses) Pellucid corneal degeneration with hydrops and detachment of Descemet's membrane Medical condition Pellucid marginal degeneration ![]()
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