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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,
  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.

Footnotes

    Responses to this article

    • IOP measurement and central corneal thickness
      • ,
      • Richard Stodtmeister, Martina Kron, Wilhelm Gaus
      Br J Ophthalmol published online September 14, 2009
    • Re: IOP measurement and central corneal thickness - authors' reply
      • ,
      • Nicolas Feltgen and Jens Funk
      Br J Ophthalmol published online September 14, 2009

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