RESULTS	The mean relative change in corneal thickness from the preoperative values was -0.0 % 1.9 % at 1 day , 2.8 % 1.8 % at 1 week , and 3.3 % 1.7 % at 3 months in the study group and -0.9 % 2.3 % , 2.4 % 1.5 % , and 3.2 % 1.4 % , respectively , in the control group .\