Average (360° measure), superonasal (91–135°), nasal (136–225°), inferonasal (226–270°), inferotemporal (271–315°), temporal (316–45°), and superotemporal (46–90°) RNFL thickness was analyzed in this study. The RNFL thickness of each sector was calculated by incorporating the clock-hour RNFL thickness from the Cirrus HD-OCT system6. We adjusted these sectors in compliance with the structure–function correspondence map developed by Garway-Heath et al. (Fig. 2)7. Sixty-eight VF test points on 10-2 SAP, 52 VF test points except for two blind spots on 24-2 SAP, and 108 points on combined SAP were allocated to superotemporal, inferotemporal, superonasal, and inferonasal sectors by applying the Garway-Heath et al. map designed for 24-2 SAP (Fig. 2)7.

Structure–function correspondence map according to Garway-Heath et al7. (A) Topographic RNFL thickness and the corresponding VF sectors in 24-2 or 10-2 SAP and the combined VF test (B) Topographic GCIPL thickness and the corresponding 24-2 or 10-2 SAP or the combined VF test. The figure was prepared using the Excel and PowerPoint program in Microsoft Office 365 (https://www.office.com/, freely available for teachers at qualified academic institutions). I = inferior; IN = inferonasal; IT = inferotemporal; N = nasal; S = superior; SN = superonasal; ST = superotemporal; T = temporal.

Twelve VF test points from 24-2 SAP and 68 points from 10-2 SAP or combined SAP were allocated to superotemporal, inferotemporal, superonasal, and inferonasal sectors by adjusting the Garway-Heath map designed for 24-2 VF tests (Fig. 2). For the superotemporal and inferotemporal topographical structure–function relationship, superotemporal and inferotemporal GCIPL thicknesses were adopted as it is. The sum of the superior and superonasal GCIPL thicknesses was used for the superonasal sector, and the sum of the inferior and inferonasal GCIPL thicknesses was used for inferonasal sector GCIPL thickness.

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