Fig. 3From: Individualized penetrating keratoplasty using edge-trimmed glycerol-preserved donor corneas for perforated corneal ulcersSchematic diagrams for surgical steps. a Perforation with iris prolapse and shallow anterior chamber. b Iris and anterior chamber restored after Healon injection. c The recipient bed was produced with sloping surface by excising the necrotic tissue and trimming the perforation edge. d Trimmed corneal graft with wedged edge was inserted into the recipient bed. e Watertight suture. f Perforation with iris prolapse, shallow anterior chamber and large corneal ulcer. g Iris and anterior chamber restored after Healon injection. h The recipient bed was produced by excising the necrotic tissue and trimming the perforation edge. i A thin PK graft (approximately 100 μm) was transplanted to the perforated area with watertight suture. j A thicker and larger-edged trimmed LK graft was sutured onto the region of the corneal ulcerBack to article page