Comparison of Icare Rebound Tonometer with Goldmann Applanation Tonometry

Kook Lee; Ji Young Lee; Jung Il Moon; Myoung Hee Park

doi:10.3341/jkos.2013.54.2.296

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Lee, Lee, Il Moon, and Park: Comparison of Icare Rebound Tonometer with Goldmann Applanation Tonometry

Original Article

J Korean Ophthalmol Soc 2007;54(2):296-302.

Published online: 24 August 2007

DOI: https://doi.org/10.3341/jkos.2013.54.2.296

Comparison of Icare Rebound Tonometer with Goldmann Applanation Tonometry

Kook Lee, MD, Ji Young Lee, MD, Jung Il Moon, MD, PhD, Myoung Hee Park, MD, PhD

Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea

Address reprint requests to Myoung Hee Park, MD, PhD Department of Ophthalmology, Yeouido St. Mary's Hospital #10 63-ro, Yeongdeungpo-gu, Seoul 150-713, Korea Tel: 82-2-3779-1243, Fax: 82-2-3775-1245, E-mail: marypark@catholic.ac.kr

Received 5 December 20114 May 2012 Accepted 25 August 2012

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To compare Icare rebound tonometer (IRT) and Goldmann applanation tonometer (GAT) and investigate the clinical usefulness of IRT.

Methods

In a retrospective study of 131 eyes with glaucoma and glaucoma suspect, intraocular pressure (IOP) was measured with IRT and GAT. The correlation between IRT and GAT and the influence of refractive error (spherical equivalent; SE) and central corneal thickness (CCT) were analyzed.

Results

A distinct correlation between IRT and GAT was found. IOP measured with GAT was 2.23 ± 3.16 mm Hg higher than with IRT (p < 0.001). As CCT increased, IOP was measured higher with both GAT and IRT. IOP in myopic eyes (SE ≥ −5 diopter) was measured relatively lower than in hyperopic eyes (SE < −5 diopter) with GAT (+1.50 ± 0.68 mm Hg) and IRT (+1.88 ± 0.75 mm Hg).

Conclusions

IRT showed strong correlation with GAT, but IOP measured approximately 2 mm Hg lower. The IOP tends to measure lower at low CCT and in myopic eyes.

Keywords: Central corneal thickness, Goldmann applanation tonometer, Icare rebound tonometer

References

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Figure 1.

Correlation of IOP obtained by GAT and IRT (r = 0.728, p < 0.001). IOP = intraocular pressure; GAT = gold-mann applanation tonometer; IRT = Icare Rebound Tonometer.

Figure 2.

Bland-Altman plot. The differences between IOP obtained by GAT and IRT (GAT measurement minus IRT measurement) are plotted against the mean of the two measurements. IOP = intraocular pressure; GAT = goldmann applanation tonometer; IRT = Icare Rebound Tonometer; SD = standard deviation.

Figure 3.

Scatter plot of CCT versus IOP obtained by GAT (r = 0.242, p = 0.005). CCT = central corneal thickness; IOP = intraocular pressure; GAT = goldmann applanation tonometer.

Figure 4.

Scatter plot of CCT versus IOP obtained by IRT (r = 0.224, p = 0.010). CCT = central corneal thickness; IOP = intraocular pressure; IRT = Icare Rebound Tonometer.

Figure 5.

Scatter plot of CCT versus ΔIOP (GAT-IRT) (r = 0.002, p = 0.978). CCT = central corneal thickness; IOP = intraocular pressure; GAT = goldmann applanation tonometer; IRT = Icare Rebound Tonometer.

Table 1.

Comparison of intraocular pressure (IOP) measured with Goldmann applanation tonometer (GAT) and Icare rebound tonometer (IRT) between operated eyes and non-operated eyes

	Non-operated eyes (n = 102)	Operated eyes (n = 29)							p-value
	Non-operated eyes (n = 102)	Total (n = 29)	Refractive surgery (n = 8)	K+P* (n = 16)	K+P+Trabe^† (n = 2)	ppV^‡ (n = 1)	PPKP +Trabe^§ (n = 1)	K+P +m.op^П (n = 1)	p-value
Age (years)	55.16 ± 13.51	56.83 ± 20.50							0.681
GAT (mm Hg)	16.22 ± 3.43	16.17 ± 6.07	13.00 ± 2.78	17.00 ± 6.24	10.50 ± 0.71	27.00	18.00	27.00	0.971
IRT (mm Hg)	14.22 ± 4.21	13.14 ± 5.06	11.50 ± 2.73	12.56 ± 4.79	10.00 ± 0.00	23.00	22.00	23.00	0.300
CCT (μm)	540.65 ± 36.52	531.38 ± 67.05	465.88 ± 85.56	553.38 ± 38.70	547.00 ± 0.00	542.00	574.00	619.00	0.480

Values are presented as mean ± SD.

CCT = central corneal thickness.

^* Phacoemulsification and posterior chamber intraocular lens implantation

^† Phacoemulsification and posterior chamber intraocular lens implantation and trabeculectomy

^‡ Pars plana vitrectomy

^§ Partial penetrating keratoplasty and trabeculectomy

^П Phacoemulsification and posterior chamber intraocular lens implantation and muscle operation (strabismus surgery).

Table 2.

Comparison of intraocular pressure (IOP) measured with Goldmann applanation tonometer (GAT) and Icare rebound tonometer (IRT) between myopic (SE ≥ −5 diopter) and relatively hyperopic (SE < −5 diopter) eyes

	SE < −5 D (n = 110)	SE ≥ −5 D (n = 13)	p-value
Age (years)	58.29 ± 14.28	45.15 ± 12.69	0.002
GAT (mm Hg)	16.57 ± 4.29	15.08 ± 1.98	0.037
IRT (mm Hg)	14.34 ± 4.62	12.46 ± 2.18	0.019
CCT (μm)	542.42 ± 37.83	551.00 ± 27.94	0.430

Values are presented as mean ± SD.

SE = spherical equivalent; CCT = central corneal thickness.

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