Visual improvement was identified in 25 eyes from group A ( 54.3 % ) and 19 from group B ( 32.2 % , p = 0.019 , RR 1.65 ) ; the difference only persisted when initial visual acuity was 0.5 ( 10 [ 40 % ] , group A , 5 [ 14.7 % ] , group B , p = 0.02 , RR 2.72 ) .