Two eyes were subjected to surgical intervention (peripheral annular graft=1 and lamellar graft=1). The visual acuity improved with rigid gas-permeable contact lens in six eyes and the final visual acuity ranged from 20/400 to 20/30. Orbscan was carried out in two eyes of one patient and revealed an area of increased elevation in relation to the best-fit sphere superiorly corresponding to the area of ectasia in both the eyes. Topographic features including vertical corridor of reduced power, against-the-rule astigmatism and superior loop cylinder were seen in 10 eyes. Ectasia was seen below the site of thinning in all the cases of superior PMCD. The extent of thinning was commonly seen between the 10 and 2 o'clock positions. The degree of thinning varied from 30 to 90%. The visual acuity at presentation ranged from hand motions to 20/25. One patient was a diagnosed case of vernal keratoconjunctivitis. The patients ranged in age from 18 to 48 years. In all, six patients were males and two were females. Improvement in visual acuity with spectacles or contact lens correction, surgical procedure if any, and final visual acuity were analysed. Detailed history, visual acuity at presentation, degree of astigmatism, slit-lamp examination findings, topographic features, and Orbscan findings were noted where available. Retrospective chart review of 15 eyes of eight patients of superior PMCD. To report the clinical features and topographic findings of superior pellucid marginal corneal degeneration (PMCD).
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