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Illustration of various modifications to corneal cross-linking. (A) Standard “epithelium-off” Dresden Protocol (B) Transepithelial Protocol with Chemical Enhancers (C) Transepithelial Protocol with Iontophoresis (D) Hypoosmolar Riboflavin for Thin Corneas (E) Customised Protocol (F) Boost Epithelium-On Protocol (G) Contact-Lens Assisted Corneal Cross-Linking (H) Epi-Off-Lenticule-On Corneal Cross-linking.
