Agreement of Intraocular Pressure Measurements between Ophthalmologist and Ophthalmic Nurse Using Goldmann Applanation and Icare Rebound Tonometry Methods in Eye Clinic of Phetchabun Hospital

Abstract

Objective: This study compared the consistency of intraocular pressure measurements between the iCare rebound tonometer, measured by ophthalmic nurses, and the standard Goldmann Applanation Tonometry (GAT), measured by ophthalmologists. Methods: Prospective Cross-sectional hospital based study. Results: This study enrolled 225 eyes from 113 patients to compare intraocular pressure (IOP) measurements obtained using rebound tonometry (iCare IC200) and Goldmann applanation tonometry (GAT). Intraclass correlation coefficients (ICCs) were calculated to assess inter-method reliability. Lin's concordance correlation coefficient, along with Bland-Altman analysis, was employed to evaluate the relationship and agreement between the two measurement methods. The findings indicated excellent agreement between iCare tonometry and GAT. Furthermore, corneal thickness did not significantly influence the consistency of IOP measurements for either method. Conclusion: This study indicates that the iCare tonometer is a reliable tool for measuring intraocular pressure, comparable to the standard GAT method, and may be beneficial for glaucoma screening in the community and for measuring intraocular pressure in situations where the GAT method is limited.