title: The Icare-Pro Rebound Tonometer Versus the Hand-held Applanation Tonometer in Congenital Glaucoma.
abstract: OBJECTIVE
  To compare intraocular pressure (IOP) measurements obtained using the new rebound tonometer Icare-Pro and the hand-held version of Goldmann Applanation Tonometer (Perkins tonometer) in children with primary congenital glaucoma (PCG) under general anesthesia.
  
  
  METHODS
  Using both tonometers, 3 IOP measurements were prospectively determined in 1 single session. Icare-Pro was always used first, and then Perkins. All measurements were recruited in 50 eyes of 50 patients with PCG under general anesthesia. Central corneal thickness, anterior chamber depth, and axial length were also measured in each patient. Data were compared by determining interclass correlation coefficient for each tonometer and representing the differences detected as Bland-Altman plots.
  
  
  RESULTS
  Good linear correlation was observed between IOP readings obtained using the Perkins and Icare-Pro (r=0.75, P<0.001), although the Icare-Pro readings were slightly higher (mean IOP difference 0.42 ± 3.69 mm Hg, P=0.41). A Bland-Altman plot revealed the 95% limits of agreement between the 2 methods: 7.7 to -6.8 mm Hg (slope=0.109, P=0.32). Intraclass correlation coefficient was 0.74 (95% confidence interval, 0.59-0.84) showing good agreement. For both tonometers, no correlation was detected between IOP measurements and central corneal thickness and axial length, but positive relation was found with anterior chamber depth.
  
  
  CONCLUSIONS
  IOP measurements determined using the new Icare-Pro rebound tonometer showed good correlation with those obtained using the hand-held Perkins applanation tonometer in children with PCG under general anesthesia.
authors.affiliation: Clínico San Carlos Hospital, Madrid, Spain.
authors.forename: Lara
authors.initials: L
authors.lastname: Borrego Sanz
authors.forename: Laura
authors.initials: L
authors.lastname: Morales-Fernandez
authors.forename: Jose M
authors.initials: JM
authors.lastname: Martínez de-la-Casa
authors.forename: Federico
authors.initials: F
authors.lastname: Sáenz-Francés
authors.forename: Manuel
authors.initials: M
authors.lastname: Fuentes
authors.forename: Julián
authors.initials: J
authors.lastname: García-Feijóo
mesh_terms: D000768:Anesthesia, General; D058452:Axial Length, Eye; D002648:Child; D002675:Child, Preschool; D063171:Corneal Pachymetry; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D006871:Hydrophthalmos / Q000175:diagnosis* / Q000503:physiopathology; D007223:Infant; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D011446:Prospective Studies; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation*