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Biomicroscopic image of the right eye of a 29-year-old male patient. (A) Three years after excimer laser-assisted lamellar keratoplasty, a mild central scar secondary to delayed epithelial healing is visible. (B) Two years after customized photorefractive keratectomy and corneal collagen cross-linking with riboflavin and ultraviolet A irradiation, the central scar is considerably reduced and the overall corneal clarity appears improved.
