Globe rupture is a major postoperative complication after penetrating keratoplasty (PK). Because the corneal wound is never comparable with that of healthy corneal tissue, globe rupture following blunt trauma occurs at the corneal graft-host junction. In this study, we report a case of scleral rupture that arose from blunt trauma occurring after PK.A 60-year-old female presented with loss of vision, redness and pain in the left eye, which was the consequence of blunt trauma, was our case in this study. Slit-lamp examination revealed ecchymosis on the eyelids, diffuse subconjunctival hemorrhage and total hyphema.The donor cornea was intact.The right eye showed PK, the cornea was transparent, and the sclera was blue. A 2 mm rupture behind the limbus extending from 3 o'clock to 9 o'clock in the upper half of the sclera was observed during exploratory surgery. She did not report any coexisting medical conditions except for systemic hypertension. The differential diagnosis of the bluish discoloration of her sclera was investigated. In detailed anamnesis, the patient reported that she had been treated for severe allergic eye disease during childhood.Vernal keratoconjunctivitis complication was diagnosed. It should be kept in mind that closed scleral perforation may occur in the patient with PK and blue sclera due to blunt trauma.