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PMD is a degenerative corneal condition, often confused with keratoconus, that is the second most common noninflammatory corneal thinning disorder behind keratoconus. It is typically characterised by a clear, bilateral thinning (ectasia) in the inferior and peripheral region of the cornea, although some cases affect only one eye. PMD typically presents in the second to fifth decade of life. The cause of the disease remains unclear.

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