Comparison of Intraocular Pressure as Measured by Three Different Non-contact Tonometers and Goldmann Applanation Tonometer for Non-glaucomatous Subjects

Seung Pil BangChong Eun LeeYu Cheol Kim
Dept. of Ophthalmology (안과학)
Issue Date
BMC Ophthalmology, Vol.17(1) : 199-199, 2017
BACKGROUND: To compare the measurement of intraocular pressure (IOP) among the three different non-contact tonometers (NCT) and the Goldmann applanation tonometer (GAT) for non-glaucomatous subjects. METHODS: In 52 eyes of 52 non-glaucomatous subjects, IOP was measured sequentially with the Canon TX-20P, the Nidek NT-530P, the Topcon CT-1P, and the GAT at the same time. We evaluated the IOP-measurement agreement among the tonometers as well as the factors affecting the measurements. RESULTS: A significant positive correlation was shown between the IOP values obtained with GAT and each NCT. The Canon TX-20P showed statistically the most significant agreement with the GAT (ICC 0.906, 95% CI 0.837-0.946). In an analysis of the Bland-Altman plots, the Canon TX-20P also showed the largest mean bias (1.38 mmHg) but the narrowest limits of agreement (LoA) (95% LoA; ± 3.43 mmHg). The Topcon CT-1P showed the smallest mean bias (0.48 mmHg) but the widest LoA (95% LoA; ± 4.16 mmHg). The Topcon CT-1P and Nidek NT-530P both showed a significantly positive correlation between increasing central corneal thickness (CCT) and increasing IOP. CONCLUSION: There was a statistically significant correlation between each of the three different NCT and the GAT measurements. IOP measured with the Canon TX-20P and Topcon CT-1P tended to be higher, and with the Nidek NT-530P lower, than with the GAT. Practitioners need to know the properties of their own NCTs and their respective measurement tendencies.
Central corneal thicknessGoldmann applanation tonometerIntraocular pressureNon-contact tonometer
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1. Journal Papers (연구논문) > 1. School of Medicine (의과대학) > Dept. of Ophthalmology (안과학)
Keimyung Author(s)
김유철; 이종은
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