Endogenous eczema represents a considerable risk for perforating keratoplasty because of the associated chronic surface disorders and complex immunological disturbances. Between December 1986 through October 1991 we performed 24 perforating keratoplasties in 20 eyes of 18 patients with endogenous eczema suffering from keratokonus, atopic keratokonjunctivitis and bullous keratopathy after intracapsular cataract extraction. During the follow-up period of 16 (3-48) months 6 transplants failed mostly due to surface problems as well as immune reactions and bacterial transplant infections. Systemically administered ciclosporin A was found to eliminate many of the previously unsolved problems. In summary, 18 out of 20 eyes achieved an improved visual acuity with clear transplants.