Topographic changes in contralateral eye of a case of Terrien’s marginal degeneration

Abstract

A woman in her late twenties presented with blurring of vision in the right eye for 6 years. Retinoscopy showed a scissoring reflex in the right eye with best spectacle-corrected visual acuity of 20/40 in the right eye and 20/20 in the left eye. Slit-lamp examination of the right eye showed superior crescentic thinning with conjunctivalisation and lipid deposition while the left eye was normal. Corneal topography of the right eye showed inverse crab-claw pattern suggestive of Terrien’s marginal degeneration (TMD) and the left eye showed inferior steepening with posterior elevation and thinning suggestive of keratoconus-like topography. This case shows that evaluation of the other apparently normal eye with 20/20 vision might show changes on topography in cases of unilateral TMD and needs follow-up to assess any further progression.

Does Corneal Topography Using 3-Dimensional Optical Coherence Tomography Suggest Different Subtypes of Terrien Marginal Degeneration?

“…[6][7][8] Corneal topography of an Indian woman with TMD showed an inverse CC pattern in 1 eye and mild inferior steepening and thinning that was reminiscent of forme fruste keratoconus in the fellow eye. 9 During our NOTED study, we noticed repeating topography patterns, including CC, in axial power maps, which even changed to another pattern during follow-up as the disease progressed. Anterior-segment optical coherence tomography (AS-OCT), which calculates keratometric, anterior, posterior, and pachymetric indices based on anterior and posterior corneal surface data, is a versatile tool to further analyze the patterns.…”