Corneal Collagen Cross-Linking for Late Onset Progressive Keratoconus in Iridocorneal Endothelial Syndrome

Purpose: the aim of this study was to report the first case of successful use of corneal collagen cross-linking (CXL) to halt the progression of keratoconus in a patient with concurrent iridocorneal endothelial (ICE) syndrome. methods:A 30-year-old white man was referred to our subspecialty corneal clinic for further investigation of right corectopia. the patient was asymptomatic and was otherwise fit. Slit-lamp examination revealed a right oval-shaped pupil decentered superiorly, a transillumination defect at the 5-o'clock position, minimal gutta-like changes in the corneal endothelium, and few inferior peripheral anterior synechiae. dilated fundoscopy was normal in both eyes, with healthy optic discs, maculae, and peripheral retinae. specular microscopy and slit-lamp findings suggested ICE syndrome. subsequent investigation with corneal tomography showed progressive signs of inferior corneal ectasia with steepening, and thinning in the right eye, consistent with keratoconus. the left eye was unremarkable. results:epithelium-off accelerated corneal CXL was performed in the affected eye. early post-CXL follow-up (1 week) was unremarkable, and further follow-ups were arranged at 3, 6, 12, and 24 months, respectively. In subsequent reviews, the patient's vision and corneal tomography findings were stable.conclusions:we describe the first case of corneal CXL for progressive keratoconus with ICE syndrome. co-existing keratoconus and ICE syndrome can occur, and corneal cross-linking was used successfully in this case to halt keratoconus progression. however, further studies will need to establish the impact of epithelium-off corneal cross-linking, especially in more severely affected eyes.