Pellucid marginal degeneration

摘要

Pellucid marginal degeneration is a rare, bilateral, non‐inflammatory, peripheral thinning disorder of the inferior cornea. It is characterised by large degrees of central against the rule astigmatism and with the rule astigmatism in the area of Melbourne thinning. While it is often misdiagnosed as keratoconus, pellucid marginal degeneration may be distinguished from this more common condition on the basis of slit‐lamp findings, keratometry and spectacle acuity. This paper outlines the diagnosis and management of a case of pellucid marginal degeneration, with particular emphasis being placed upon the differential diagnosis from keratoconus and the contact lens management of the condition through fitting with bitoric rigid gas‐permeable (RGP) contact lenses.(Clin Exp Optom1993; 76: 6: 21