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Detection of the exact area of corneal neovascularization using slit-lamp photography is often difficult. Thus, we evaluated corneal neovascularization in patients with limbal stem cell deficiency using optical coherence tomography angiography (OCTA).Five patients with 5 eyes showing partial or total limbal stem cell deficiency were enrolled. Three eyes had severe corneal scarring. Five 6- × 6-mm images (frontal, upper, lower, nasal, and temporal) were obtained by OCTA. Slit-lamp photography was performed for all patients on the same day.OCTA has 2 advantages over slit-lamp photography for clear demonstration of corneal neovascularization. First, OCTA can show neovascularization in cases with severe corneal opacification. Second, OCTA can detect not only large vessels but also small vessels that cannot be seen by slit-lamp photography.OCTA is a powerful tool for objective evaluation of vascularization in the anterior and posterior segments of the eye. We have demonstrated that OCTA can visualize corneal neovascularization in patients with corneal diseases more clearly than slit-lamp photography.