Purpose.To determine the benefit of bilateral penetrating keratoplasty with regard to binocular vision.Methods.We compared patients who underwent corneal transplantation bilaterally with patients who had successful corneal transplantation in one eye and corneal disease in the other eye. Specifically, changes in fusion, stereopsis, and binocular vision function were analyzed. A questionnaire regarding performance of daily tasks was given.Results.Patients with bilateral keratoplasty performed better in all the analyzed functions. Fusion was achieved by 81.25% in the unilateral group versus 100% in the bilateral group (p= 0.15). Stereopsis was present more in the bilateral group (100% vs. 62.5%,p= 0.008) and the quantity of stereopsis was significantly better in the bilateral group (121 seconds of arc vs. 1,284 seconds of arc,p= 0.014). 88.8% of the patients subjectively improved in daily activities after second eye surgery.Conclusion.There are objective and subjective improvements after bilateral penetrating keratoplasty.