The authors would like to acknowledge missing data for all prior latanoprost users as a whole. The following sentence has been added to the manuscript (page 8, first paragraph): Mean (SD) reduction from baseline at Month 6 for users of all latanoprost formulations (preserved and PF) was 6.1 (4.25) mmHg (25.9%; p\0.0001). The authors have also prepared a table to summarise the change in intraocular pressure following a switch to the preservative-free tafluprost/timolol fixed-dose combination from all latanoprost formulations (preserved and preservative-free formulations). See Table 1 below.(Table Preseneted.) .The original article has been corrected.