title: Comparison of Perkins, Tono-Pen and Schiøtz tonometers in paediatric patients under general anaesthesia.
abstract: This cross-sectional study aimed to investigate if the Tono-Pen, Schiøtz and Perkins tonometers could be used interchangeably in general practice for measuring elevated intraocular pressure. A total of 74 eyes of 37 paediatric patients under general anaesthesia were checked with all 3 tonometers. All of the tonometers gave significantly different measurements from each other. However, with a mean difference of 1.4 mmHg and 95% limits of agreement of -5.7 to +8.6, the greatest agreement was between the Perkins and Tono-Pen tonometers. The Perkins tonometer is a hand-held variant of the Goldmann tonometer (the gold standard for intraocular pressure measures). Therefore the Tono-Pen with its ease of use and safety could be a reliable device for use in general practice.
authors.affiliation: Eye Research Centre, Department of Ophthalmology Khatam Al-Anbia Eye Hospital, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran.
authors.forename: H
authors.initials: H
authors.lastname: Gharaei
authors.forename: A
authors.initials: A
authors.lastname: Kargozar
authors.forename: F
authors.initials: F
authors.lastname: Raygan
authors.forename: R
authors.initials: R
authors.lastname: Daneshvar
mesh_terms: D000704:Analysis of Variance; D000768:Anesthesia, General; D015982:Bias; D003430:Cross-Sectional Studies; D005194:Family Practice; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D007429:Intraocular Pressure; D007492:Iran; D008297:Male; D012449:Safety; D012680:Sensitivity and Specificity; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000592:standards; D015351:Vision Screening / Q000295:instrumentation