Comparison of current tonometry techniques in measurement of intraocular pressure

Kouchaki, B. and Hashemi, H. and Yekta, A. and khabazkhoob, M. (2017) Comparison of current tonometry techniques in measurement of intraocular pressure. Journal of Current Ophthalmology, 29 (2). pp. 92-97.

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Purpose To compare four tonometry techniques: Goldmann applanation tonometer (GAT), Dynamic contour tonometer (DCT), Non-contact tonometer (NCT), and Ocular Response Analyzer (ORA) in the measurement of intraocular pressure (IOP) and the impact of some corneal biomechanical factors on their performance. Methods In this cross-sectional study, volunteers with normal ophthalmic examination and no history of eye surgery (except for uncomplicated cataract surgery) or trauma were selected. Twenty-five subjects were male, and 21 were female. The mean age was 48 ± 19.2 years. Anterior segment parameters were measured with Scheimpflug imaging. IOP was measured with GAT, DCT, NCT, and ORA in random order. A 95 limit of agreement of IOPs was analyzed. The impact of different parameters on the measured IOP with each device was evaluated by regression analysis. Results The average IOP measured with GAT, DCT, NCT, and ORA was 16.4 ± 3.5, 18.1 ± 3.4, 16.2 ± 3.9, and 17.3 ± 3.4 mmHg, respectively. The difference of IOP measured with NCT and GAT was not significant (P = 0.382). Intraocular pressure was significantly different between GAT with DCT and IOPCC (P < 0.001 and P = 0.022, respectively). The 95 limit of agreement of DCT, NCT, and IOPCC with GAT was −5.7 to 2.5, −4.1 to 4.7, and −5.3–3.7 mmHg, respectively. Simple regression model corneal resistance factor (CRF) and central corneal thickness (CCT) and multivariate model CRF had a significant relationship with IOP measured with the four devices. Conclusion Although the mean difference of measured IOP by NCT, DCT, and ORA with GAT was less than 2 mmHg, the limit of agreement was relatively large. CCT and CRF were important influencing factors in the four types of tonometers. © 2017 Iranian Society of Ophthalmology

Item Type: Article
Additional Information: Cited By :17 Export Date: 16 February 2020 Correspondence Address: khabazkhoob, M.; Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical SciencesIran; email:
Uncontrolled Keywords: Dynamic contour tonometer Goldmann applanation tonometer Intraocular pressure Non-contact tonometer Ocular response analyze Tonometry adult aged Article central corneal thickness corneal resistance factor cross-sectional study female human intermethod comparison male non contact tonometer ocular response analyzer pressure measurement tonometer very elderly visual system parameters
Subjects: WW Ophthalmology
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib3 lib3
Date Deposited: 03 Mar 2020 10:51
Last Modified: 03 Mar 2020 10:51

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