“…Ten studies 106,107,145,154,165,167,184,207,209,211 (71%) reported whether or not the examiner(s) were masked to the results. In seven studies 106,107,145,165,207,209,211 (50%), the tonometers used were calibrated. Almost all studies 106,107,145,154,165,167,184,189,190,207,[209][210][211] (13, 93%) included all participants approached in the analysis or stated a reason why not.…”