[Dynamic Contour Tonometry and Goldmann Applanation Tonometry: Difference of Intraocular Pressure Values Between Eyes with and without Glaucomatous Damage in Thin Corneas].

Abstract:

BACKGROUND:To examine the differences in intraocular pressure (IOP) measurements obtained with Goldmann applanation tonometry (GAT) and Pascal dynamic contour tonometry (DCT) in subjects with thin corneas and to correlate these with structural and functional parameters of glaucoma damage. PATIENTS AND METHODS:One hundred and thirty participants (130 eyes) with central corneal thickness lower than 500 µm were included in five groups in this cross-sectional observational study: 52 eyes with primary open angle glaucoma (POAG), 19 eyes with normal tension glaucoma (NTG), 27 eyes with ocular hypertension (OHT), 21 participants suspected of having glaucoma (GS), and 11 healthy subjects. The measurements were obtained with GAT and DCT in a masked fashion. The corrected GAT-IOP for central corneal thickness (CCT), the difference between DCT and GAT (ΔIOP = DCT-GAT) and corrected ΔIOP (corrected ΔIOP = DCT-corrected GAT) were calculated. Age, mean deviation (MD) from the most recent reliable visual field examination, average retinal nerve fibre layer thickness (RNFL), cup-to-disc ratio (CDR), ocular pulse amplitude (OPA), and treatment status were recorded for statistical analysis. RESULTS:In all of the subjects (n = 130), the mean DCT, GAT and corrected GAT values were 17.6 ± 3.4 mmHg, 13.2 ± 3.8 mmHg, and 15.5 ± 2.1 mmHg, respectively. ΔIOP and corrected ΔIOP were 4.4 ± 2 mmHg and 1.7 ± 2 mmHg, respectively. ΔIOP was correlated negatively with MD (rs = -0.32, p < 0.0001) and average RNFL thickness (r = -0.46, p < 0.0001) and positively with CDR (rs = 0.50, p < 0.0001). The mean IOP measured by GAT differed statistically significantly between eyes with glaucoma (n = 71, POAG and NTG) and eyes without damage (n = 59; OHT, GS, and healthy) (p < 0.0001), whereas the mean IOP by DCT did not (p = 0.935). The mean ΔIOP values were also statistically significantly higher in the glaucomatous group, with and without correction for CCT (p < 0.001). OPA and glaucoma diagnoses statistically significantly predicted ΔIOP (R(2) = 0.41, F2.127 = 47.46, p < 0.0001). CONCLUSION:Greater underestimation of IOP by GAT was observed in the glaucomatous eyes with thin corneas. Performing DCT on patients with thin corneas might be advantageous in establishing the need for more aggressive treatment.

journal_name

Klin Monbl Augenheilkd

authors

Umurhan Akkan JC,Akkan F,Sezgin Akcay BI,Ayintap E,Tuncer K

doi

10.1055/s-0041-104772

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

1190-7

issue

10

eissn

0023-2165

issn

1439-3999

journal_volume

232

pub_type

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