scholarly journals Does Rebound Tonometry Probe Misalignment Modify Intraocular Pressure Measurements in Human Eyes?

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ian G. Beasley ◽  
Deborah S. Laughton ◽  
Benjamin J. Coldrick ◽  
Thomas E. Drew ◽  
Marium Sallah ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Healthy Subjects ◽  
Angular Deviation ◽  
Visual Axis ◽  
Rebound Tonometer ◽  
Significance Levels ◽  
Iop Measurement ◽  
Lateral Displacements ◽  
The Right ◽  
Icare Rebound Tonometer

Purpose. To examine the influence of positional misalignments on intraocular pressure (IOP) measurement with a rebound tonometer.Methods. Using the iCare rebound tonometer, IOP readings were taken from the right eye of 36 healthy subjects at the central corneal apex (CC) and compared to IOP measures using the Goldmann applanation tonometer (GAT). Using a bespoke rig, iCare IOP readings were also taken 2 mm laterally from CC, both nasally and temporally, along with angular deviations of 5 and 10 degrees, both nasally and temporally to the visual axis.Results. Mean IOP ± SD, as measured by GAT, was14.7±2.5 mmHgversusiCare tonometer readings of17.4±3.6 mmHg at CC, representing an iCare IOP overestimation of2.7±2.8 mmHg (P<0.001), which increased at higher average IOPs. IOP at CC using the iCare tonometer was not significantly different to values at lateral displacements. IOP was marginally underestimated with angular deviation of the probe but only reaching significance at 10 degrees nasally.Conclusions. As shown previously, the iCare tonometer overestimates IOP compared to GAT. However, IOP measurement in normal, healthy subjects using the iCare rebound tonometer appears insensitive to misalignments. An IOP underestimation of <1 mmHg with the probe deviated 10 degrees nasally reached statistical but not clinical significance levels.

scholarly journals The effect of body position on intraocular pressure in calves

2018 ◽  
Vol 89 ◽  
Author(s):  
Başak Kurt ◽  
Halil H. Çağatay ◽  
Özgür Aksoy
Keyword(s):  
Intraocular Pressure ◽  
Body Position ◽  
Diagnostic Device ◽  
Rebound Tonometer ◽  
Age Related ◽  
Wide Range ◽  
Iop Measurement ◽  
The Mean ◽  
The Right ◽  
Lateral Recumbency

Tonometry is one of the basic diagnostic tests used for the diagnosis of glaucoma and uveitis in veterinary ophthalmology. The Icare® Rebound Tonometer which is a new tonometric device has been shown to be useful in a wide range of species. Eyes (n = 48) of 24 Simmental and Montafon calves with a mean age of 7.5 weeks (2–16 weeks), male and female, were subjected to intraocular pressure (IOP) measurement using the Icare® Rebound Tonometer with calves standing and in lateral recumbency. The mean IOP was measured as 9.02 ± 2.38 mmHg in the right eye and 9.08 ± 2.55 mmHg in the left eye. No age-related change was found in intraocular pressure of the calves between 2 and 16 weeks of age. No difference in IOP values was observed between Simmental and Montafon calves. Body position had no effect on IOP in calves. The Icare® Rebound Tonometer was shown to be a suitable diagnostic device for IOP measurement in calves.

scholarly journals Intraocular Pressure Measurement Using Ocular Response Analyzer, Dynamic Contour Tonometer, and Scheimpflug Analyzer Corvis ST

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Lisa Ramm ◽  
Robert Herber ◽  
Eberhard Spoerl ◽  
Frederik Raiskup ◽  
Lutz E. Pillunat ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Healthy Subjects ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Ocular Response Analyzer ◽  
Corvis St ◽  
Dynamic Contour Tonometer ◽  
Iop Measurement ◽  
Good Agreement

Purpose. To compare intraocular pressure (IOP) measurements with Goldmann applanation tonometry (GAT), ocular response analyzer (ORA), dynamic contour tonometer (DCT), and Corvis ST (CST) in healthy subjects. Methods. In a prospective, observational study, IOP measurements with GAT (GAT-IOPc), ORA (IOPcc), DCT (DCT-IOP), and CST (bIOP) were performed and analyzed in 94 healthy subjects. Results. Mean age of the participants was 45.6 ± 17.2 years (range 18 to 81 years). Mean GAT-IOPc was 12.9 ± 2.4 mmHg, mean DCT-IOP was 16.1 ± 2.6 mmHg, and mean IOPcc was 15.6 ± 3.3 mmHg. DCT-IOP and IOPcc were significantly higher than GAT-IOPc (P<0.001). Mean bIOP was 13.5 ± 2.4 mmHg that was slightly higher but not significantly different from GAT-IOPc (P=0.146). Correlation analysis of IOP values and central corneal thickness (CCT) revealed a negative correlation between GAT-IOPc and CCT (r = −0.347; P=0.001). However, IOPcc, DCT-IOP, and bIOP showed no significant correlation to CCT. Only bIOP revealed a weak but significant age dependency (r = 0.321, P=0.002). Conclusion. All tonometry devices showed a good agreement of biomechanical corrected IOP values with GAT-IOPc. As no influence of CCT on IOPcc, DCT-IOP, and bIOP was detectable, the used correction algorithms appear to be appropriate in these tonometers in the clinical setting. The highest agreement was found between GAT-IOPc and bIOP. However, bIOP weakly correlated with participants’ age. Further studies are needed to elucidate the role of bIOP for IOP measurement.

Home assessment of diurnal intraocular pressure in healthy children using the Icare rebound tonometer

2012 ◽  
Vol 16 (1) ◽  
pp. 58-60 ◽  
Author(s):  
Ya-Chuan Hsiao ◽  
Jacqueline R. Dzau ◽  
Meghan S. Flemmons ◽  
Sanjay Asrani ◽  
Sarah Jones ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Healthy Children ◽  
Rebound Tonometer ◽  
Icare Rebound Tonometer

scholarly journals Diagnostic accuracy of the iCare rebound tonometer compared to the Perkins applanation tonometer in assessing intraocular pressure in rural patients

Diagnosis ◽  
2015 ◽  
Vol 2 (4) ◽  
pp. 227-234 ◽  
Author(s):  
Yifan Li ◽  
Christopher R. Carpenter ◽  
Kathryn Nicholson ◽  
William Ken Milne
Keyword(s):  
Intraocular Pressure ◽  
Rural Communities ◽  
Diagnostic Accuracy ◽  
Gold Standard ◽  
Screening Tool ◽  
Unmet Need ◽  
Negative Likelihood Ratio ◽  
Rebound Tonometer ◽  
Applanation Tonometer ◽  
Icare Rebound Tonometer

AbstractVision health is recognized as a critical unmet need in North America. The ocular morbidity associated with glaucoma results from increased intraocular pressure (IOP) and early detection is crucial for the management of glaucoma. Our objective was to find a diagnostically accurate screening tool for intraocular hypertension that can be used in rural communities. We sought to validate the diagnostic accuracy of the iCare rebound tonometer against the gold standard Perkins applanation tonometer (PAT) in measuring IOP.Patients from two rural communities in Ontario, Canada visiting their optometrists for routine appointments had their IOP measured by a non-contact tonometer (NCT), an iCare rebound tonometer, and a Perkins applanation tonometer (PAT). Values of sensitivity, specificity, and likelihood ratios for a positive and negative result were calculated for the iCare and the NCT.Complete data was collected from 209 patients. Overall, the iCare tonometer had high levels of validity, as compared to the gold standard PAT. The iCare tonometer displayed excellent sensitivity of 98.3% (90–99%, 95% CI) and excellent negative likelihood ratio of 0.024 (0.0088–0.066, 95% CI) which is useful for ruling out intraocular hypertension.The iCare tonometer is a reasonably valid tool for detecting elevated IOP. Its ease of use, simplicity, and accessibility makes it a good screening tool to improve eye health in rural areas.

scholarly journals Evaluation of intraocular pressure estimates obtained using an iCare rebound tonometer

2016 ◽  
Vol 100 (2) ◽  
pp. 179-183 ◽  
Author(s):  
Safal Khanal ◽  
Meredith Walton ◽  
Pinakin Gunvant Davey
Keyword(s):  
Intraocular Pressure ◽  
Rebound Tonometer ◽  
Icare Rebound Tonometer

Evaluation of the ICare Rebound Tonometer as a Home Intraocular Pressure Monitoring Device

2011 ◽  
Vol 20 (2) ◽  
pp. 74-79 ◽  
Author(s):  
Sanjay Asrani ◽  
Ashmita Chatterjee ◽  
David K. Wallace ◽  
Cecilia Santiago-Turla ◽  
Sandra Stinnett
Keyword(s):  
Intraocular Pressure ◽  
Monitoring Device ◽  
Pressure Monitoring ◽  
Rebound Tonometer ◽  
Icare Rebound Tonometer
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