![]() The leading parameters of refractive status, objectively determining the value of best corrected visual acuity, are induced corneal astigmatism and K. CONCLUSION: The study showed the presence of relationship between functional and refractive changes indices of eyes with pellucid marginal degeneration. RESULTS: To develop a clinical classification of pellucid marginal degeneration by stages, we selected: the values of corneal astigmatism, best corrected visual acuity and Index of difference between the values of maximum and minimum keratometry (K), all of which had good separation of obtained data, and their demarcate values in groups. The 1st group 12 patients (12 eyes) with fully corrected induced ametropia (best corrected visual acuity 0.8), the 2nd group 17 patients (17 eyes) with partially corrected induced ametropia (0.8 and 0.3), the 3rd group 13 patients (13 eyes) with uncorrected induced ametropia (0.3). Keratometry and refractometry were performed, uncorrected and best corrected visual acuity, as well as cylindrical and spherical components of subjective refraction were studied, and retinal visual acuity was determined. MATERIALS AND METHODS: The study included 42 people (42 eyes) with pellucid marginal degeneration. AIM: The aim was to develop a classification of pellucid marginal degeneration based on investigation of relationship between functional and refractive changes. The developed classifications of keratoconus cannot be fully applied to pellucid marginal degeneration. This is due to the low frequency of pellucid marginal degeneration in the structure of primary keratectasia, the main type of which is keratoconus. At the moment, there is no unanimity with regards to the optimum surgical treatment of PMD and larger prospective studies will be required to form a more robust algorithm for the surgical approach of PMD individuals whose vision cannot be corrected with spectacles or contact lenses.īACKGROUND: One of the problems in the diagnosis and treatment of pellucid marginal degeneration of the cornea is the difficulty of systematizing its manifestations due to the lack of classification. To date, there are no large prospective interventional studies to elucidate the optimum surgical approach for advanced PMD, only case reports or case series.Ĭonclusion: Eye care practitioners need to be aware of the clinical and topographic findings of this disease, since laser refractive surgery is a contraindication. Management of PMD includes the use of contact lenses, spectacles and a wide range of surgical techniques with variable results. PMD patients are at risk of corneal perforation after minimal ocular trauma or even spontaneously. It mainly affects the inferior cornea and induces against the rule irregular corneal astigmatism. Results: PMD is a rare ectatic disorder of the cornea that may resemble keratoconus especially at the early stages. Materials and Methods: Literature review via PubMed, Mendeley, Scopus and Google Scholar. Purpose: To describe the clinical features of Pellucid Marginal Degeneration (PMD) and to give an overview of current treatment options.
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