rss
Br J Ophthalmol 2001;85:85-87 doi:10.1136/bjo.85.1.85
  • Scientific correspondence

Correlation between central corneal thickness, applanation tonometry, and direct intracameral IOP readings

  1. Nicolas Feltgen,
  2. Dorothee Leifert and
  3. Jens Funk
  1. Department of Ophthalmology, Albert-Ludwigs- University Freiburg, Germany
  1. Dr med Nicolas Feltgen, Universitäts-Augenklinik, Killianstrasse 5, 79106 Freiburg, Germanyfeltgen{at}aug.ukl.uni-freiburg.de
  • Accepted 27 July 2000

Abstract

BACKGROUND Several authors reported incorrect high intraocular pressure (IOP) values in eyes with a thick cornea using applanation tonometry. This hypothesis was checked by comparing applanation tonometry with direct intracameral manometry.

METHODS 73 patients, scheduled for intraocular surgery, were enrolled. Immediately before surgery, the following were registered: (i) central corneal thickness (CCT), (ii) applanatory IOP (Perkins/Tonopen), and (iii) intracameral IOP.

RESULTS The difference between applanatory and intraocular measurements was completely independent of CCT (y=−3.43+3.8x; where y is the difference between applanatory and intracamerally measured IOP (mm Hg) and x is CCT (mm);r 2=0.002; p=0.72).

CONCLUSIONS There is no systematic error of applanation tonometry with increasing CCT. Therefore it is inadequate to recalculate IOP based on regression formula of applanatory IOP versus CCT.

Notes

    Responses to this article

    • Re: IOP measurement and central corneal thickness - authors' reply
      • ,
      • Nicolas Feltgen and Jens Funk
      Br J Ophthalmol published online July 29, 2009
    • IOP measurement and central corneal thickness
      • ,
      • Richard Stodtmeister, Martina Kron, Wilhelm Gaus
      Br J Ophthalmol published online July 29, 2009

    This Article

    1. Abstract
    2. Full text
    3. PDF

    Register for free content

    The full back archive is now available for all BMJ Journals. Institutional subscribers may access the entire archive as part of their subscription. Personal subscribers will also have access to all content when logged in. Non-subscribers who register have free access to all articles published before 2006 right back to volume 1 issue 1. Register here to access the free archive of all BMJ Journals.

    Don't forget to sign up for content alerts so you keep up to date with all the articles as they are published.