Postoperative data collection
Two outcome measures were considered for analyzing endothelial cells after surgery: corneal endothelial cell density (ECD) and central corneal thickness (CCT). The examiner was blinded, so he did not know to which group each patient belonged.CCT and ECD were measured using a Topcon® SP-3000P noncontact specular microscope (Topcon, Tokyo, Japan). The central method was used for cell counting. Three readings were taken and an average was taken as a result. Extreme variations in values were discarded [The other variables shown in specular microscopy were also analyzed, such as number of cells, average size, standard deviation and the coefficient of variation of the size, and the hexagonality.