Percent change in the IOP at 17:00 at the end of treatment is 37.2 % 13.4 % group and 35.7 % 13.0 % in Tafluprost and Latanoprost group.In addition , distribution of subjects with percentage decrease of IOP > 30 % was 72.5 % in Tafluprost group higher than 63.8 % in Latanoprost group .