Fig 1
From: Choroidal thickness in Chinese patients with non-arteritic anterior ischemic optic neuropathy
Enhanced depth optical coherence tomography scan with 360° 3.4 mm diameter peripapillary circle scan for measurement of choroidal thickness. a Diagram showing segmentation of the peripapillary choroidal thickness measurements in the arithmetic mean of sum in each segment (G) and six segments including nasal superior (NS), nasal (N), nasal inferior (NI), temporal inferior (TI), temporal (T), temporal superior (TS) segments. b Manual delineation of the choroidal layer between the outer border of the retinal pigment epithelium and the inner surface of the sclera for measurement of choroidal thickness