title: Influence of IOP measurement through the wrong eyepiece of the slit lamp on Goldmann applanation tonometry.
abstract: OBJECTIVE
  This study examined whether intraocular pressure (IOP) measurements through the wrong eyepiece of the slit lamp may be a source of error.
  
  
  METHODS
  Seven skilled observers measured the IOP from seven healthy subjects. The observers used a Haag-Streit Goldmann applanation tonometer with two types of slit lamps (Haag-Streit and Rodenstock). In the Haag-Streit slit lamp the prism of the tonometer is aligned with the right part of the slit lamp optics. Conversely, in the Rodenstock slit lamp, the prism is aligned with the left. Each observer measured the IOP of each subject through the right eyepiece, through the left eyepiece, and under binocular vision.
  
  
  RESULTS
  The IOP measured with the left eyepiece of the Haag-Streit slit lamp was significantly higher than that measured with the right eyepiece and binocular vision. The IOP measured with the right eyepiece of the Rodenstock slit lamp was significantly higher than that measured with the left eyepiece and binocular vision.
  
  
  CONCLUSIONS
  IOP measurement through the wrong eyepiece of the slit lamp may be a source of error.
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu - Japan. tkubota@med.uoeh-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Kubota
authors.forename: T
authors.initials: T
authors.lastname: Nagata
authors.forename: A
authors.initials: A
authors.lastname: Tawara
authors.forename: H
authors.initials: H
authors.lastname: Okada
authors.forename: S
authors.initials: S
authors.lastname: Ishibashi
authors.forename: M
authors.initials: M
authors.lastname: Yamashita
authors.forename: Y
authors.initials: Y
authors.lastname: Harada
authors.forename: M
authors.initials: M
authors.lastname: Yanase
mesh_terms: D000328:Adult; D003951:Diagnostic Errors; D005260:Female; D005901:Glaucoma / Q000175:diagnosis; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D014065:Tonometry, Ocular / Q000295:instrumentation*; D015348:Vision, Binocular