The clinical features were suggestive of PMD, which was supported by his corneal scans – Atlas, Pentacam, and Optovue. Corneal examination in both eyes showed inferior band thinning, 2 mm above the inferior limbus, extending from 4 to 8 clock hours, with bulging of the cornea just above the thinning. There was exotropia of 15º (40 prism diopter base in) in the right eye with suppression (Worth four dot test). On examination, both eyes had high against the rule astigmatism, which was more in the right eye. His unaided vision in his right eye was 1/60 and in his left eye it was 6/36. We report a case of sensory exotropia due to PMD in association with VKC.Ĭase Details: A 19-year old boy with a history of VKC presented with exotropia of the right eye of 3 years’ duration. Pellucid marginal degeneration (PMD) is a bilateral, asymmetrical, ectatic disorder of the cornea characterized by inferior corneal thinning.
Leena Bajracharya, 1 Nisha Agrawal, 2 Shashwat Dhungel, 3 Rojeeta Parajuli, 4 Srijana Adhikari 4ġCornea Department, Tilganga Institute of Ophthalmology, Kathmandu, Nepal 2Pediatric Ophthalmology and Strabismus Department, Taparia Eye Care, Biratnagar, Nepal 3Department of Refractive Surgery, Tilganga Institute of Ophthalmology, Kathmandu, Nepal 4Pediatric Ophthalmology and Strabismus Department, Tilganga Institute of Ophthalmology, Kathmandu, NepalĬorrespondence: Leena Bajracharya Nisha Agrawal Tel +977 1449 3775Įmail īackground: Vernal keratoconjunctivitis (VKC), an allergic disease, has a known association with ectatic disorders of the cornea.