Abstract
Objective
To evaluate the relationship between the Goldmann applanation tonometer (GAT) and
the iCare PRO and iCare IC200 tonometers in measuring intraocular pressure (IOP) in
adult eyes with a diagnosis of glaucoma or glaucoma suspect.
Participants and methods
One hundred and one eyes from 101 participants diagnosed with glaucoma or glaucoma
suspect were evaluated in this study. IOP was measured by iCare PRO and iCare IC200
tonometers in a randomized sequence followed by IOP measurements by the GAT tonometer
and then central corneal thickness measurements. After the IOP measurements, participants
scored their comfort level using a visual analog scale with each tonometer. Intraclass
correlation coefficient (ICC) and Bland–Altman analysis were used to investigate the
agreement among tonometers. SPSS and Microsoft Excel programs were used for statistical
analysis.
Results
Overall, there was good agreement among the 3 tonometers used in this study. The ICC
for the iCare PRO and the iCare IC200 was 0.95 (p < 0.001), and the ICC for the iCare PRO and the GAT and the iCare IC200 and the GAT
was >0.80 (p < 0.001). However, both iCare tonometers underestimated IOP by approximately 2 mm
Hg compared with the GAT. Furthermore, 84% of iCare readings fall within ±5 mm Hg
of GAT measurements. Neither body mass index nor central corneal thickness affected
the IOP agreement among the tonometers. Participant response on visual analog scale
rated IOP measurements by iCare tonometers to be more comfortable than the GAT.
Conclusion
Our results demonstrated a good agreement between iCare tonometers and GAT; but iCare
tonometers underestimated IOP compared to the GAT.
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Article info
Publication history
Published online: July 06, 2022
Accepted:
June 7,
2022
Received in revised form:
May 31,
2022
Received:
September 27,
2021
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 Canadian Ophthalmological Society. Published by Elsevier Inc. All rights reserved.
