Riboflavin (vitamin B2) acts as a photosensitizing agent in the corneal crosslinking procedure. The riboflavin is activated by ultraviolet (UV) light, creating a singlet oxygen molecule which facilitates the formation of new covalent bonds between glycosaminoglycans and other molecules in the corneal stroma. This helps to strengthen the corneal tissue, restore its mechanical strength, and halt the progression of keratoconus or corneal ectasia. At Waite Vision, we use an effective epi-on CXL protocol to ensure the safety and efficacy of the corneal crosslinking treatment.