title: Comparison of ICare and IOPenvsGoldmann applanation tonometry according to international standards 8612 in glaucoma patients.
abstract: OBJECTIVE
  To compare IOPen and ICare rebound tonometry to Goldmann applanation tonometry (GAT) according to International Standards Organization (ISO) 8612 criteria.
  
  
  METHODS
  Totally 191 eyes (n=107 individuals) were included. Criteria of ISO 8612 were fulfilled: 3 clusters of IOP, measured by GAT, were formed. The GAT results were given as mean±standard deviation.
  
  
  RESULTS
  GAT (19.7±0.5 mm Hg) showed a significant correlation to ICare (19.8±0.5 mm Hg) (r=0.547,P<0.001) and IOPen (19.5±0.5 mm Hg) (r=0.526,P<0.001). According to ISO 8612 criteria in all 3 IOP groups the number of outliers (of the 95% limits of agreement) exceeded 5% for ICare and IOPenvsGAT: No.1 (n=68) 29.4% and 22.1%, No.2 (n=62) 35.5% and 37.1%, No.3 (n=61) 26.2% and 42.6%, respectively.
  
  
  CONCLUSIONS
  The strict requirements of the ISO 8612 are not fulfilled in a glaucoma collective by ICare and IOPen at present. As long as the Goldmann tonometry is applicable it should be used first of all for reproducible IOP readings. ICare and IOPen tonometry should be considered as an alternative tool, if application of Goldmann tonometry is not possible.
authors.affiliation: Glaucoma and Retinal Degeneration Research Group, UCL, Institute of Ophthalmology, Bath Street, London, EC1V 9EL, United Kingdom.
authors.forename: Milena
authors.initials: M
authors.lastname: Pahlitzsch
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Jeanette
authors.initials: J
authors.lastname: Brünner
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Johannes
authors.initials: J
authors.lastname: Gonnermann
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Anna-Karina B
authors.initials: AB
authors.lastname: Maier
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Necip
authors.initials: N
authors.lastname: Torun
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Eckart
authors.initials: E
authors.lastname: Bertelmann
authors.affiliation: Department of Ophthalmology, Campus Virchow Clinic, Charite University Medicine, Augustenburger Platz 1, Berlin13353, Germany.
authors.forename: Matthias Kj
authors.initials: MK
authors.lastname: Klamann
keywords: Goldmann applanation tonometry; ICare tonometry; IOPen tonometry; glaucoma; intraocular pressure