This review describes the clinical features of PMD, its differential diagnosis and various management strategies presently available.Ĭopyright © 2010 British Contact Lens Association. Since patients with PMD make poor candidates for laser vision correction, an awareness of the topographical and slit-lamp features of PMD will be useful to clinicians screening for signs of corneal abnormality before corneal refractive surgery. Several surgical procedures have been used in an attempt to improve visual acuity when spectacles and contact lenses do not provide adequate vision correction. The vast majority of PMD patients are managed using spectacles and contact lenses. In rare cases, patients may present with a sudden loss of vision and excruciating ocular pain due to corneal hydrops or spontaneous perforation. Visual signs and symptoms include longstanding reduced visual acuity or increasing against-the-rule irregular astigmatism leading to a slow reduction in visual acuity. Unless corneal topography is evaluated, early forms of PMD may often be undetected however, in the later stages PMD can often be misdiagnosed as keratoconus. Ocular signs and symptoms of patients with PMD differ depending on the severity of the condition. The prevalence and aetiology of this disorder remain unknown. The condition is most commonly found in males and usually appears between the 2nd and 5th decades of life affecting all ethnicities. Pellucid marginal corneal degeneration (PMCD) is a bilateral noninflammatory ectatic peripheral corneal disorder usually involving the inferior portion of the cornea. And the o͞o sound (reminiscent of the word moon?) is delightful to speak and to hear.Pellucid marginal corneal degeneration (PMD) is a rare ectatic disorder which typically affects the inferior peripheral cornea in a crescentic fashion. But on reflection, I think it’s the entire word: pəˈlo͞osid / The “pell” makes me think of a bell. Initially, I thought my favourable response could be attributed to the double L sound. The word ‘pellucid’, meaning clear, was first used by Schlaeppi 1 to denote the clarity of the cornea in this condition despite the presence of ectasia. Too bad, because I think it’s an extraordinarily beautiful one. Pellucid marginal corneal degeneration (PMD) is a rare idiopathic, thinning disorder of the peripheral cornea most usually affecting the inferior quadrant in a crescentic fashion. It refers to corneal thinning and I imagine that’s why the doctor who invented the term expropriated the word. Incidentally, there is also an eye disease called pellucid marginal degeneration. The adjective, which dates to the 1610s, comes from the Latin pellucidus meaning “transparent.” And this, in turn, comes from from pellucere meaning to “shine through,” from per- “through” and lucere “to shine.” There was a smattering of hair across his scalp, but his eyes were a pellucid blue.įrequently used to describe eyes, the word means “clear” or “translucent” or “something that allows the maximum passage of light.” It also can be used metaphorically, to describe something clear in meaning, expression or style, such as pellucid writing. allowing the maximum passage of light, as glass translucent. Here is the sentence in which he used it: I encountered it, recently, when I read the book Let the Great World Spin, by Column McCann. There are certain words I like mainly because of the sound of them. CONCLUSION: The study showed the presence of relationship between functional and refractive changes indices of eyes with pellucid marginal degeneration. Increase your vocabulary and you’ll make your writing much more precise.
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