Comparison and comparability of pneumotonometry and rebound tonometry results with Maklakov’s applanation tonometry

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BACKGROUND: Introduction and use of various tonometry methods can lead to misinterpretation of intraocular pressure results and influence the choice of treating approaches by ophthalmologist in a glaucoma patient.

AIM: To compare pneumotonometry and rebound tonometry results with Maklakov’s applanation tonometry and to develop corrections for their comparability.

MATERIALS AND METHODS: The study included 75 patients. All subjects underwent Maklakov applanation tonometry (10 g) and pachymetry (Topcon SP-3000P). In 48 patients (94 eyes) of the 1st group, pneumotonometry (TONOREF™ II Nidek) was performed, and 27 patients of the 2nd group (52 eyes) underwent rebound tonometry (iCare™ IC-100).

RESULTS: The mean difference in intraocular pressure level in the 1st group was –4.81 (p < 0.001), and in the 2nd –0.98 mmHg (p = 0.399). Both methods — pneumo- and rebound tonometry showed underestimated results with intraocular pressure less than 23.0 and 22.5 mmHg (respectively) relative to applanation tonometry and, conversely, overestimated intraocular pressure when these values were exceeded. A significant (p < 0.001) strong (R2 = 0.86) relationship between applanation and rebound tonometry was obtained, which made it possible, using regression analysis, to develop a formula for recalculating results of iCare tonometry into those of Maklakov tonometry: PMaklakov = 0.40 × PiCare + 13.44.

CONCLUSIONS: Both pneumo- and rebound tonometry demonstrate adequate results of P0 with intraocular pressure below 23.0 and 22.5 mmHg (respectively) and overestimate the results when these values are exceeded. The developed formula allows converting the results of iCare tonometry into the values of the Maklakov’s tonometry.

作者简介

Dmitrii Belov

St. Petersburg Multifield Hospital No. 2; Saint Petersburg State University

编辑信件的主要联系方式.
Email: belovd1990@gmail.com
ORCID iD: 0000-0003-0776-4065
SPIN 代码: 2380-2273

MD, Cand. Sci. (Med.), ophthalmologist

俄罗斯联邦, Saint Petersburg; Saint Petersburg

Natalia Zumbulidze

North-Western State Medical University named after I.I. Mechnikov

Email: guramovna@gmail.com
ORCID iD: 0000-0002-7729-097X
SPIN 代码: 4439-8855

MD, Cand. Sci. (Med.), assistant professor

俄罗斯联邦, Saint Petersburg

Amina Yusupova

North-Western State Medical University named after I.I. Mechnikov

Email: aminausupova4821@gmail.com
ORCID iD: 0009-0004-5562-204X
SPIN 代码: 7522-8060

resident doctor

俄罗斯联邦, Saint Petersburg

Farhod Kasymov

St. Petersburg Multifield Hospital No. 2; North-Western State Medical University named after I.I. Mechnikov

Email: farkkas@yahoo.com
ORCID iD: 0009-0004-4368-143X
SPIN 代码: 7778-6309

MD, Cand. Sci. (Med.), ophthalmologist

俄罗斯联邦, Saint Petersburg; Saint Petersburg

参考

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2. Fig. 1. Dependence of Maklakov’s applanation tonometry from pneumotonometry

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3. Fig. 2. Dependence of Maklakov’s applanation tonometry from rebound tonometry (iCare)

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4. Fig. 3. Dependence of pneumotonometry values from central corneal thickness (R2 = 0.07; p = 0.017)

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5. Fig. 4. Dependence of rebound tonometry (iCare) values from central corneal thickness (R2 = 0.01; p = 0.420)

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版权所有 © Belov D.F., Zumbulidze N.G., Yusupova A.I., Kasymov F.O., 2023

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