Reliability of the Non-contact TONO-i Tonometer Compared with the Goldmann Applanation Tonometer

Purpose: The accuracy and agreement of intraocular pressure (IOP) measurements using a noncontact self-measuring tonometer, TONO-i, compared with the Goldmann applanation tonometer (GAT).Methods: A total 35 healthy participants 42 primary open angle or normal tension glaucoma patients were enrolled in this study. TONO-i GAT obtained mean difference IOPs was analyzed paired <i>t</i>-test. IOP calculated two-way random effects model. Bland-Altman analysis simple linear regression used to estimate disagreement between measurements.Results: measured 15.9 ± 3.3 mmHg 16.4 5.1 mmHg, respectively. In patients, values (16.7 4.1 mmHg) lower than those (17.9 6.1 mmHg; <i>p</i> < 0.001). However, there no significant among (<i>p</i> = 0.273). intraclass coefficients (95% confidence interval) for all participants, 0.847 (0.702-0.920), 0.882 (0.804-0.941), 0.828 (0.742-0.887), respectively, indicating good measurements. limits not statistically significant. As increased, absolute also increased.Conclusions: novel may be reliably self-measurement detecting elevations. caution must exercised because possibility underestimating high IOPs.