Background
The aim of this study was to evaluate the sensitivity, specificity, and likelihood ratio of standard diagnostic parameters C/D, NFI, and MD and their applicability in diagnostics of primary open-angle glaucoma.
Material and Methods
This study included 194 subjects (371 eyes), ages 30 to 65 years old, who underwent full ophthalmologic examination and HRT, GDx, and FDT examinations. The values of C/D, NFI, and MD diagnostic parameters were determined. The data were statistically evaluated to determine their sensitivity, specificity, and likelihood ratio.
Results
Values of the positive and negative likelihood ratios were C/D (11.471 and 0.159), NFI (3.739 and 0.152), and MD (6.323 and 0.309), respectively.
Conclusions
The C/D parameter showed the highest sensitivity and specificity, as well as high positive likelihood ratio and near-zero negative likelihood ratio. The NFI and MD parameters showed lower likelihood ratios and their applicability for the diagnosis of primary open-angle glaucoma is limited.

Keywords: Optic Disk - pathology, Nerve Fibers - pathology, Likelihood Functions, Glaucoma, Open-Angle - diagnosis, Diagnostic Techniques, Ophthalmological - standards, Reference Standards, Retina - pathology, Sensitivity and Specificity