FIGURE 3.

Schematic of C4, C6, and C2 central visual field (VF) sectoring scheme on 24-2 Humphrey VF. The retinal nerve fiber layer regions mapped to C6 and C2 on the peripapillary circle (1.73 mm around optic nerve head [ONH]) are annotated with yellow and dark red colors, respectively. C4, C6, and C2 refer to the 4, 6, and 2 most central VF locations from our annular scheme, the Garway-Heath scheme, and the macular vulnerability zone proposed by Hood and associates,¹⁶ respectively.