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Avellino corneal dystrophy worsening after LASIK: special histopathologic staining. (Top) Histologic section of the central corneal recipient tissue, staining deep red with the Masson trichrome stain (original magnification ×200). (Middle) The section stains weakly with Congo red (original magnification ×200). (Bottom) Staining with thioflavin T. No fluorescence is exhibited under the fluorescent microscope (original magnification ×200).
