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Purpose: To study the circumpapillary retinal nerve fiber layer thickness (cpRNFLT) in a 10°-wide sector using spectral-domain optical coherence tomography for diagnostic ability in early stage open-angle glaucoma (OAG). Methods: cpRNFLT measurements (3.4-mm diameter centered on the disc) were obtained from 89 eyes with early stage OAG (mean deviation, −2.5 ± 1.8 decibels) and 89 age-matched normal eyes. The ability of 180°-, 90°-, 30°-, and 10°-wide cpRNFLT sectors in discriminating early stage OAG eyes was evaluated by calculating the area under the receiver-operating characteristic curves (AUCs) and sensitivity/specificity per diagnostic criteria with varying sector widths, normative data-based cpRNFLT cutoff levels and numbers of abnormal sectors. The intra- and inter-visit reproducibilities of the cpRNFLT 10°-sector measurements were studied in a separate group of eyes with normal and early stage OAG. Results: The greatest AUC obtained using the cpRNFLT 10° sector, 0.924 (confidence interval, 0.875-0.958), did not differ significantly from those obtained with the 180°, 90°, and 30° sectors. Only calculations using the 10° sectors had sensitivities and specificities of 0.90 or higher with the best performance of the sensitivity/specificity of 0.92/0.94. These values tended to be better ( P = 0.070) than with the 30° sectors, 0.85/0.94, which were also selected with several combinations of various cutoff levels and the number of abnormal sectors. The coefficients of variation for the intra- and inter-visit reproducibility of the 10°-sector measurements were 10 % or less in 32 and 24 of the 36 sectors. Conclusion: The cpRNFLT 10°-sector measurements showed reasonable reproducibility and identified eyes with early stage OAG with a sensitivity and specificity of 0.92/0.94. [ABSTRACT FROM AUTHOR]