Comparison of the iCare rebound tonometer and the Goldmann applanation tonometer over a wide IOP range

Munkwitz, S.; Elkarmouty, Ahmed; Hoffmann, Esther M.; Pfeiffer, Norbert; Thieme, Hagen

doi:10.1007/s00417-007-0758-3

Cited by 113 publications

(87 citation statements)

References 24 publications

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“…In the present study a good agreement of IOP readings between the two different tonometers was detected, as it has widely reported in literature [16] [17] [18].…”

Section: Discussionsupporting

confidence: 89%

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

Giacinto¹,

D’Aloisio²,

Trovarelli³

et al. 2018

OJOph

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Purpose: to compare the rebound tonometer ICare® (RT) with the Goldmann applanation tonometer (GAT) in cataract surgery and to assess the influence of central corneal thickness (CCT) on intraocular pressure (IOP) measurements. Design: retrospective, comparative study. Methods: a total of 472 patients underwent IOP measurement using RT (time 0 = RTa). GAT IOP measurement was performed 5 minutes later, followed by a second RT IOP measurement after other 5 minutes (RTa + 10 min = RTb). CCT was obtained by ultrasound pachymetry. In 106 patients IOP was measured by means of RT and GAT before clear corneal cataract surgery (RT1 and GAT1) and at one day postoperatively (RT2 and GAT2). Results: RT IOP values > 5 mmHg were overestimated, while RT IOP values < 15 mmHg were underestimated. Every 100 µm of CCT an increase of 0.97 mmHg and 0.33 mmHg was found for RT and GAT respectively. The difference between RT1 and RT2, GAT1 and GAT2, RT1 and GAT1 was not statistically significant; while the difference between RT2 and GAT2 was statistically significant (p < 0.04). The difference between RTa and RTb was not statistically significant whereas the difference between RTa and GAT and RTb and GAT was statistically significant (p < 0.001). Conclusion: our results showed a good agreement between measurements obtained with RT and GAT in pre and postoperative cataract surgery, although a significant statistically difference was found between RT and GAT measurements performed postoperatively. Moreover, CCT is a parameter to be considered for the IOP measurement, especially for values obtained with RT.

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“…In the present study a good agreement of IOP readings between the two different tonometers was detected, as it has widely reported in literature [16] [17] [18].…”

Section: Discussionsupporting

confidence: 89%

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

Giacinto¹,

D’Aloisio²,

Trovarelli³

et al. 2018

OJOph

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show abstract

“…The effect is known from current tonometry methods such as the iCare tonometer (Munkwitz et al, 2008), Tono-pen (Giaconi et al, 2016), or air-puff tonometers (Derka, 1980) that the sensitivity decreases at higher IOP levels (Yung et al, 2014;Giaconi et al, 2016;Eklund et al, 2000). This is explained by the fact that the possible deformation of the eye with a constant force decreases, which leads to a lower signal-to-noise ratio.…”

Section: Discussionmentioning

confidence: 99%

“…The Tiolat iCare measurement device evaluates the bounce-back of a small plastic stick that is shot onto the cornea, and is therefore considered to use a dynamic principle. The iCare reaches a deviation of ±3 mmHg from the GAT measurements (Munkwitz et al, 2008). Although it is not considered a self-tonometer and generates higher deviations when it is not pointed directly on the vertex (Muttuvelu et al, 2012), it helps with the IOP measurement for children (Grigorian et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The influence of intraocular pressure on the damping of a coupled speaker–air–eye system

Osmers¹,

Patzkó

Hoppe³

et al. 2018

J. Sens. Sens. Syst.

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Abstract. Although glaucoma is currently the world's most common cause of irreversible blindness, there is no curative therapy available to date. The major risk factor that can be influenced in order to stop disease progression is the eye pressure (IOP). Therefore early diagnosis of an altered IOP is essential for the goal of preserving vision. A novel IOP measurement principle for a handheld noncontact self-tonometer shall be validated.The measurement principle uses a pressure pulse generated by a loudspeaker to cause vibrations of the eye. In order to reach the required sound pressure, a closed pressure chamber is placed on the human orbit. With a microphone and a displacement sensor the dynamic behavior of the entire system is detected. In this article the abovementioned principle is being analyzed on porcine eyes under laboratory conditions.The combination of the loudspeaker, the pressure chamber, and the eye to be measured can be described as a coupled spring-mass-damper system. It is demonstrated for enucleated porcine eyes that a defined IOP variation leads to a change in the system's damping ratio. Considering only stochastic deviations, the derived standard uncertainty for the determination of the IOP amounts to < 1 mmHg in the physiological range.The in vitro measurements on porcine eyes help the understanding of the underlying physics and demand for further research on the influence of biometric parameters on eye vibrations. However, the laboratory results provide the basis for a gentle noncontact tonometry method with great applicational prospects. Data is currently being collected on human subjects in a clinical trial, to corroborate the measurement principle in vivo.

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“…RBT is practical to use and measurements are comparable to GAT. Also, it does not require slit-lamp and is more comfortable for patients, due to lack of need for topical anesthesia (8,(9)(10)(11)(12). Present study was investigation of whether RBT would produce comparable results to GAT in cases of different corneal thickness.…”

Section: Discussionmentioning

confidence: 99%

Comparison Of Goldmann Applanation Tonometry and Icare Rebound Tonometry In Eyes With Different Corneal Thicknesses

Paşaoğlu¹

2017

Beyoglu Eye J

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Comparison of the iCare rebound tonometer and the Goldmann applanation tonometer over a wide IOP range

Abstract: The iCare tonometer is a mobile alternative to GAT in a low to moderate IOP range, but our findings show a greater deviation than previously reported. In high IOP values, measurements with the iCare tonometer do not correlate well with GAT.

Cited by 113 publications

References 24 publications

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

The influence of intraocular pressure on the damping of a coupled speaker–air–eye system

Comparison Of Goldmann Applanation Tonometry and Icare Rebound Tonometry In Eyes With Different Corneal Thicknesses

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