Agreement and repeatability of Icare ic100 tonometer

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Medical Devices

Background:

• Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
• Accurate and repeatable tonometry is essential for reliable IOP assessment.
• The Icare ic100 is a non-contact rebound tonometer.

Purpose of the Study:

• To evaluate the agreement and repeatability of the Icare ic100 tonometer.
• To compare the Icare ic100 with the Icare TA01i and Goldmann applanation tonometer (GAT).

Main Methods:

• A cross-sectional, multicenter study included 150 adult subjects with IOP ≥7 mmHg.
• Two masked examiners performed five IOP measurements using Icare ic100, Icare TA01i, and GAT.
• Intraclass correlation coefficient (ICC) and Cronbach's alpha quantified agreement; repeatability coefficient (RC) and coefficient of variation (CV) assessed test-retest variability.

Main Results:

• The Icare ic100 showed good reliability (ICC >0.78) compared to the Icare TA01i across all IOP groups.
• Compared to GAT, the Icare ic100 demonstrated good reliability (ICC >0.87), with moderate reliability (ICC = 0.52) in the >16 to <23 mmHg IOP range.
• The Icare ic100 exhibited good repeatability with RC of 2.67 and CV of 4.89.

Conclusions:

• The Icare ic100 rebound tonometer provides reliable and repeatable IOP measurements with minimal error.
• It demonstrates comparable performance to GAT across a wide IOP range.
• The Icare ic100 is a suitable device for IOP assessment without compromising corneal health.