Contact lenses with a special back surface design can improve visual acuity and lens tolerance.
No serious complications were observed.Ĭonclusions: Quantitative evaluation of videokeratographic data may help to diagnose PMCD and to distinguish PMCD from other ectatic corneal diseases. A rare disorder of the anterior segment of the eye characterized by slowly progressive, bilateral. It is becoming increasingly important to recognize as it can cause. The visual acuity with contact lenses improved in all eyes with an average increase of 2.7 lines (maximum eight lines). PMD is disease of peripheral corneal thinning that is slowly progressive over many years. It is a bilateral disease, although one eye may be affected earlier and clinically diagnosed, while the other eye has no clinical features ( 1 ). Using Zernike coefficients seven eyes (53.8%) had a higher order aberration root mean square error (HOA RMS error) out of the normal range. Looking for online definition of pellucid marginal corneal degeneration in the Medical Dictionary pellucid marginal corneal degeneration explanation free. Pellucid marginal corneal degeneration (PMCD) is a noninflammatory ectatic corneal disorder mostly involving the inferior half of the cornea in a crescentic fashion (Fig. Using Fourier analysis all PMCD subjects showed an increased irregular astigmatism of the anterior cornea. Either the superior or the inferior eccentricity, or both, were negative in all patients. Results: The mean eccentricity did not exceed 0.7 in all patients. Pellucid Marginal Degeneration (PMD keratotorus), is a degenerative corneal condition It is typically characterized by a bilateral thinning Unlike. Lens tolerance and corrected visual acuity were evaluated. The patients were followed up for an average period of 22.2 months.
The center is a schematic demonstrating that a vertical optical cut in these 2 conditions would produce a very similar corneal thickness distribution.
Methods: 13 eyes were fitted with contact lenses with a special back surface. Comparison of the corneal thickness map and vertical Scheimpflug image of true pellucid marginal degeneration (left side) vs inferior keratoconus (right side). Aim: To quantify corneal irregularities, to describe the fitting with contact lenses, and to answer the question whether or not contact lenses with a special back surface design could improve visual acuity in patients with pellucid marginal corneal degeneration (PMCD).
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