The variables studied were age, gender, base etiology for CKD, and variations in body weight and IOP before and after hemodialysis. Mean blood pressure (MBP), systolic blood pressure (SBP), diastolic blood pressure (DBP), and ocular perfusion pressure (OPP) were obtained before and after hemodialysis. The following mathematical models were used: MBP = (DBP) + 1/3 (SBP) - (DBP) and OPP = 2/3 (MBP-IOP), as described in the literature (18-20). The data were collected using a form devised for the study from the medical records of the chronic renal patients undergoing hemodialysis at SCMG and registered in the system.