J Korean Ophthalmol Soc.  2020 Jan;61(1):78-85. 10.3341/jkos.2020.61.1.78.

The Difference in Intraocular Pressure before and after Visual Field Test Measured by Rebound Tonometer

• Park JH
• Kim JY
• Lee EK
• Lee HJ
• Jeong JH
• Lee SY

• KMID: 2468479
• DOI: http://doi.org/10.3341/jkos.2020.61.1.78

Abstract

PURPOSE
To investigate the effect of a visual field (VF) test on intraocular pressure (IOP) and relevant parameters in a normal group and an open-angle glaucoma group, and to determine the appropriate time of IOP measurements.
METHODS
The IOP was measured by a rebound tonometer before and after a VF test for the normal, normal-tension glaucoma, and high-tension glaucoma groups, and IOP differences after the VF tests were compared among groups. Parameters including age, sex, axial length, central corneal thickness, IOP before the VF test, the VF index, mean deviation, VF test duration, and usage of IOP lowering medications were investigated, and the correlations of these parameters with IOP changes after VF tests were determined using linear regression analyses.
RESULTS
A total of 232 participants (232 eyes) included 55 normal subjects, 131 normal-tension glaucoma patients, and 46 high-tension glaucoma patients. The IOP differences after VF tests were not statistically significant in the normal and high-tension glaucoma groups, and the difference was 0.31 mmHg in the normal-tension glaucoma group (p = 0.013). Multivariate regression analyses revealed that axial length (p = 0.005) and IOP before the VF test (p < 0.001) were relevant factors in the total number of patients, and the axial length (p = 0.017), IOP before the VF test (p = 0.001), and duration (p = 0.029) were found to be significantly associated with IOP differences in the normal-tension glaucoma group.
CONCLUSIONS
The IOP changes after VF tests using the rebound tonometer were significant in the normal-tension glaucoma group, but were within an acceptable range. The IOP value measured after a VF test is clinically valid in clinical practice.

Keyword

Intraocular pressure; Normal tension glaucoma; Rebound tonometer; Visual field test

MeSH Terms

Glaucoma
Glaucoma, Open-Angle
Humans
Intraocular Pressure*
Linear Models
Low Tension Glaucoma
Visual Field Tests*
Visual Fields*

Figure

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  Figure 1 The distribution of intraocular pressure (IOP) changes after visual field test. Normal group (A) and high tension glaucoma group (C) show similar distribution between patients with increased and decreased IOP after visual field test, but normal tension glaucoma group showed high concentration of patients with increased IOP (B).

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