The iCare HOME tonometer is a useful tool which can be used by patients for fairly accurate and reliable self-measurement of intraocular pressure.
To compare the accuracy of intraocular pressure (IOP) measurements of trained glaucoma patients using the iCare HOME tonometer before and after a week of self-monitoring at home and study the repeatability of patient measurements done at home.
Materials and Methods:
40 glaucoma patients had IOPs measured using the Goldmann applanation tonometer (GAT) and the iCare HOME. Patients were trained to use the iCare HOME and measured their IOP twice daily over a loan period of 7 days. Bland-Altman analysis was used to assess agreement between GAT and iCare HOME readings. Intraclass correlation (ICC) compared inter-rater reliability of iCare HOME measurements, and test-retest variability for the patient’s readings over the 7-day period were analysed. A 5-point Likert scale questionnaire was used to assess the patient’s experience with the device.
Up to 32 patients (80%) were able to obtain IOP readings within 3▒mm Hg of the glaucoma nurse clinician’s readings at the pre-loan visit, and up to 36 patients (90%) at the post-loan visit. Good inter-rater reliability was observed between iCare HOME measurements by the glaucoma nurse clinician and patients. At the post-loan visit, inter-rater reliability was good for right eye readings and excellent for left eye readings. No distinct trend in test-retest variability was identified over the 7-day period. 65% of patients agreed the device was easy to use and 89% would recommend the device to other glaucoma patients.
Patients trained to use the iCare HOME device can do so with fair accuracy compared to trainers with accuracy improving within 1 week of usage.