J Korean Ophthalmol Soc.  2015 Sep;56(9):1392-1399. 10.3341/jkos.2015.56.9.1392.

Comparison of Dynamic Contour Tonometry and Goldmann Applanation Tonometry in Relation to Central Corneal Thickness

• Kim MK
• Park SY
• Kim CY
• Kim JH

• KMID: 2214555
• DOI: http://doi.org/10.3341/jkos.2015.56.9.1392

Abstract

PURPOSE
In this study we compared the intraocular pressures (IOPs) measured using dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) and investigated the correlation between central corneal thickness (CCT) and IOP.
METHODS
In a prospective study, 178 eyes of 91 subjects with glaucoma and glaucoma suspect were enrolled. IOP was measured using DCT and GAT and CCT was measured using ultrasound pachymetry. Each eye was classified into 1 of 3 groups according to their CCT: low CCT (Group A; CCT < 525 microm), normal CCT (Group B; 525 < or = CCT < 561 microm), and high CCT (Group C; CCT > or = 561 microm). In each group, we investigated the correlation between CCT and IOP measurement using GAT and DCT.
RESULTS
A significant correlation was found between CCT and IOP measured using GAT (p < 0.001), but not between CCT and IOP measured using DCT (p = 0.108) in all patients. Subgroup analysis showed that CCT affected IOP measured with GAT only in Group A (p = 0.027) and IOP measured with DCT was not affected by CCT in all 3 groups.
CONCLUSIONS
IOP measured using GAT and DCT were significantly affected by CCT, especially when the CCT was low. CCT may have no effect on DCT thus, IOP measured using DCT is more reliable than GAT in patients with thin corneas.

Keyword

Central corneal thickness; Dynamic contour tonometry; Glaucoma; Goldmann applanation tonometry

MeSH Terms

Cornea
Glaucoma
Humans
Intraocular Pressure
Manometry*
Prospective Studies
Ultrasonography

Figure

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  Figure 1. Pearson correlation of intraocular pressure measure-ments obtained by Goldmann applanation tonometer (GAT) and Dynamic contour tonometer (DCT) (r = 0.791, p < 0.001).

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  Figure 2. Bland-Altman plot of the difference between Goldmann applanation tonometer (GAT) and Dynamic con-tour tonometry (DCT) against the mean of GAT and DCT. IOP = intraocular pressure.

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  Figure 3. Pearson correlation of the difference between Dynamic contour tonometry (DCT) and Goldmann applanation ton-ometer (GAT) with CCT (r = -0.272, p < 0.001). IOP = in-traocular pressure; CCT = central corneal thickness.

Reference

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