The Induction/Impact Tonometer: a New Instrument to Measure Intraocular Pressure in the Rat

Kontiola, Antti; Goldblum, David; Mittag, Thomas W.; Danias, John

doi:10.1006/exer.2001.1088

Cited by 122 publications

(120 citation statements)

References 12 publications

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“…16 The rebound tonometer used in this study is a relatively new device based on similar physical principles as the vibration tonometer. 22,23 Reports of rebound tonometer use in rats, 15,24 mice, 14,15,25 and human patients 26,27 demonstrated that this type of tonometer is convenient to use and yields reliable data.…”

Section: Discussionmentioning

confidence: 99%

Intraocular pressure measurement in mice: a comparison between Goldmann and rebound tonometry

Kim

Kuehn

Anderson

et al. 2006

Eye

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Purpose The development of mouse models of glaucoma requires methods to accurately measure the intraocular pressure (IOP) in this species. The aim of this study was to compare the accuracy of IOP measurements in mice between modified Goldmann and rebound tonometers. Methods IOP was measured either with a modified Goldmann or a rebound tonometer while simultaneously measuring the IOP using invasive manometry in enucleated eyes and in vivo. The level of IOP was controlled hydrostatically. The agreement and correlation between the IOP determined by invasive manometry and by either noninvasive method was evaluated. In addition, the IOP was determined by both noninvasive methods in a cohort of mice with laser-induced ocular hypertension (OHT), and the agreement and correlation between the two tonometry methods were evaluated. Results Measured IOP by either noninvasive tonometer correlated well with those recorded simultaneously by invasive manometry (r ¼ 0.98 for rebound and r ¼ 0.94 for Goldmann). In mice with OHT, the IOP correlation between rebound and modified Goldmann was moderate (r ¼ 0.71); the IOP measured by modified Goldmann tonometry was consistently higher than that by rebound by approximately 5 mmHg. However, the relative per cent increases in IOP were similar between the two methods. Conclusion Both noninvasive methods of IOP measurements in mice are suitable to detect changes in IOP although rebound tonometry correlated better with the invasive manometry readings. The results suggest that the relative, rather than absolute, IOP offers a more reliable means of correlating findings from studies using different tonometers.

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Section: Discussionmentioning

confidence: 99%

Intraocular pressure measurement in mice: a comparison between Goldmann and rebound tonometry

Kim

Kuehn

Anderson

et al. 2006

Eye

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“…The motion for the probe varies on the basis of the IOP and thus can be used to determine IOP. It has been established [25][26][27] that the inverse of the deceleration time is most closely correlated with IOP. The disposable probe consists of a steel-wire shaft with a round plastic tip (1 mm in diameter) at its front end.…”

mentioning

confidence: 99%

“…This I-I tonometer has been calibrated against manometric measurements of IOP obtained by use of the eyes of Wistar rats. 27 The purpose of the study reported here was to determine the usefulness, accuracy, and reproducibility for the 2 aforementioned new automatic handheld tonometers in dogs. Additionally, we compared results for the 2 new automatic handheld tonometers with those for 2 established applanation tonometers (a commercially available applanation tonometer and the MacKay-Marg tonometer).…”

mentioning

confidence: 99%

Comparison of the use of new handheld tonometers and established applanation tonometers in dogs

Görig¹,

Coenen²,

Stades³

et al. 2006

American Journal of Veterinary Research

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“…Kontiola et al [9] were the first who studied the Icare tonometer performance in animals suggesting that RT is a reliable and non-invasive instrument for IOP reading.…”

Section: Discussionmentioning

confidence: 99%

“…RT device works on the principle of a rebound tonometry using an induction-based coil system to measure the motion parameters of a bouncing probe after colliding with the cornea [9] [10]. An advanced algorithm combined with a special software analyzes deceleration and the contact time of the probe while it touches the cornea.…”

Section: Introductionmentioning

confidence: 99%

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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The Induction/Impact Tonometer: a New Instrument to Measure Intraocular Pressure in the Rat

Cited by 122 publications

References 12 publications

Intraocular pressure measurement in mice: a comparison between Goldmann and rebound tonometry

Intraocular pressure measurement in mice: a comparison between Goldmann and rebound tonometry

Comparison of the use of new handheld tonometers and established applanation tonometers in dogs

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

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