The IOP was ( 16.33 6.21 ) mmHg ( 1 mmHg = 0.133 kPa ) , ( 15.67 2.82 ) mmHg , ( 15.35 2.22 ) mmHg and ( 13.10 3.41 ) mmHg in the bromfenac sodium group , and ( 16.87 3.68 ) mmHg , ( 14.05 2.23 ) mmHg , ( 14.39 2.22 ) mmHg and ( 13.18 2.49 ) mmHg in the control group at 10 , 30 , 90 and 180 days , respectively .