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Comparative Study
. 2009 Mar;23(1):27-31.
doi: 10.3341/kjo.2009.23.1.27. Epub 2009 Mar 9.

Comparison between dynamic contour tonometry and Goldmann applanation tonometry

Jooeun Lee  1 , Chang Hwan Lee, Jaewan Choi, Sam Young Yoon, Kyung Rim Sung, Seong Bae Park, Michael S Kook
Affiliations
Comparative Study

Comparison between dynamic contour tonometry and Goldmann applanation tonometry

Jooeun Lee et al. Korean J Ophthalmol. 2009 Mar.

Abstract

Purpose: To compare the intraocular pressures (IOPs) measured by dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT), and to investigate the association of IOPs on eyes of varying central corneal thickness (CCT).

Methods: In this prospective study, 451 eyes of 233 subjects were enrolled. IOPs were measured by GAT and DCT. CCT was measured three times and the average was calculated. Each eye was classified into one of three groups according to CCT: low CCT (group A, CCT<520 microm, n=146); normal CCT (group B, 520 microm<or=CT<or=550 microm, n=163); and high CCT (group C, CCT>550 microm, n=142). In each group, we investigated the association of CCT with IOP measurement by GAT and DCT.

Results: The IOPs measured by GAT and DCT were significantly associated for all eyes (R=0.853, p<0.001, Pearson correlation). CCT was related with both IOP measurement by GAT and DCT with statistical significance (mixed effect model, p<0.001). However, subgroup analysis showed that CCT affected IOP measured by GAT for groups B and C, whereas it affected IOP measured by DCT only for group C.

Conclusions: IOP measured by DCT was not affected by CCT in eyes with low to normal CCT, whereas this measurement was affected in eyes of high CCT range. CCT may have less effect on IOP measurements using DCT than those obtained by GAT, within a specified range of CCT.

Keywords: Central corneal thickness; Dynamic contour tonometry; Goldmann applanation tonometry.

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Figures

Fig. 1
Fig. 1
Pearson correlation analysis of intraocular pressure (IOP) measurements obtained by Goldmann tonometry and dynamic contour tonometry (n=451, R=0.853, p<0.001).
Fig. 2
Fig. 2
(A) Association of central corneal thickness (CCT) with intraocular pressure (IOP) measurement by Goldmann applanation tonometry (GAT) (n=451, R=0.330, p<0.001). (B) Association of CCT with IOP measurement by Pascal-dynamic contour tonometry (P-DCT) (n=451, R=0.271, p<0.001).
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