title: Frequency of Goldmann applanation tonometer calibration error checks.
authors.forename: Izak F
authors.initials: IF
authors.lastname: Wessels
mesh_terms: D002138:Calibration / Q000592:standards*; D006801:Humans; D007429:Intraocular Pressure; D011446:Prospective Studies; D011786:Quality Control; D015203:Reproducibility of Results; D013997:Time Factors; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000592:standards*