Figure 1
Structure of the RNFL and its relationship with the SDOCT and SAP tests (best viewed in color): (a) The axons from the retinal ganglion cells converge to the optic disc in a characteristic arcuate pattern while deviating from the fovea (F)21. The temporal, superior, nasal and inferior regions of the retina are respectively labeled T, S, N, and I while the optic disc is labeled O. (b) SAP measures visual function at 54 locations (2 location near the blind spot being excluded in our analysis) on the retina (cyan and yellow dots), centered (red ‘+’) at the fovea. Because of lateral inversion in the eye, the SAP locations in the superior hemiretina (yellow dots) are responsible for inferior vision while those in the inferior hemiretina (cyan dots) are responsible for superior vision. SDOCT measures the RNFL thickness at 768 equally-spaced locations along the (green) circle around the optic disc.
