Figure 2
Measurements of the β- and γ-zone peripapillary atrophy (PPA) and angle of scleral bending. (A) The area of β-zone PPA was measured as an inner crescent of chorioretinal atrophy (dashed yellow line) on fundus photograph images. (B) The γ-zone PPA was measured as the distance between anterior scleral opening (yellow arrow) and Bruch membrane opening (blue arrow) on the optical coherence tomography image (along with the blue line in panel A). To measure the angle of scleral bending, 2 tangent lines were drawn along the surface of the sclera on both sides of the scleral bending (orange lines). The angle between the 2 lines was measured, as shown with an orange arch.
