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Characteristics of Linear Interstitial Keratitis by In Vivo Confocal Microscopy and Anterior Segment Optical Coherence Tomography

Purpose: To describe the findings of in vivo confocal microscopy (IVCM) and anterior segment optical coherence tomography (AS-OCT) in a case of linear interstitial keratitis (IK), a very rare entity of unknown etiology. Methods: IVCM and AS-OCT were used in the case of the a 23-year-old patient with recurrent unilateral linear IK. Results: On AS-OCT, inflammation appeared confined to the anterior part of the stroma. Similar to color photography, inflammation appeared beaded. On IVCM, there was microcystic epithelial edema, dense fibrosis of the anterior stroma, highly reflective spiculated structures, and disorganization of the stromal architecture. Conclusions: Although linear IK appeared as localized anterior stromal inflammation on AS-OCT, panstromal inflammation was revealed by IVCM.