Fig. 2

Parameters of localized retinal nerve fiber layer (RNFL) defect were identified using RNFL photography. a Localized RNFL defect of a left eye without labeling. b Localized RNFL defect with labeled parameters. c Schematic illustration of (b). d Localized RNFL defect of a right eye without labeling. e Localized RNFL defect with labeled parameters. f Schematic illustration of (e). Localized RNFL defect is defined with the white arrows. Reference line d is the line between the macula center and the optic disc center. Angle α is the angular width between the reference line and the proximity of the RNFL defect. Angle β (+c) is the sum of angular width(s) of localized RNFL defect