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Br J Ophthalmol 2001;85:85-87 ( January )

Scientific correspondence

Correlation between central corneal thickness, applanation tonometry, and direct intracameral IOP readings Nicolas Feltgen, Dorothee Leifert, Jens Funk

Department of Ophthalmology, Albert-Ludwigs- University Freiburg, Germany

Correspondence to: Dr med Nicolas Feltgen, Universitäts-Augenklinik, Killianstrasse 5, 79106 Freiburg, Germany feltgen{at}aug.ukl.uni-freiburg.de

Accepted for publication 27 July 2000

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); r2=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.

© 2001 by British Journal of Ophthalmology


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IOP measurement and central corneal thickness
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