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

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 measure...

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Bibliographic Details
Published in:Journal of Ophthalmology 2013-01, Vol.2013 (2013), p.510-515
Main Authors: Beasley, Ian G., Laughton, Deborah S., Coldrick, Benjamin J., Drew, Thomas E., Sallah, Marium, Davies, Leon N.
Format: Article
Language:English
Subjects:
Accuracy
Analysis
Bias
Clinical Study
Cornea
Intraocular pressure
Measurement
Probes (Electronic instruments)
Statistical analysis
Studies
Tonometry
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Summary: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, was 14.7±2.5 mmHg versus iCare tonometer readings of 17.4±3.6 mmHg at CC, representing an iCare IOP overestimation of 2.7±2.8 mmHg (P
ISSN:2090-004X
2090-0058
DOI:10.1155/2013/791084