Fig. 2

A schema showing the biometric parameters of the optic disc and posterior staphyloma measured using swept-source optical coherence tomography. A The optic disc tilt was illustrated as the tilt of the line connecting the opening of Bruch’s membrane on the nasal and temporal sides of the optic disc (yellow line). B The vertical distances between the anterior edge of the RPE beneath the fovea and the nasal or temporal edges 3 mm from the fovea (yellow arrow) were averaged as the depth of the posterior staphyloma. The choroidal thickness was defined as the vertical distance between the posterior edge of the Bruch’s membrane and chorioscleral interface (red arrow). Dashed line: fovea