Fig. 1.

(A) Fundus photograph and (B,C) spectral-domain optical coherence tomography (OCT) images in the enhanced depth imaging (EDI) mode in a 78-year-old woman with normal-tension glaucoma. The mean intraocular pressure was 10 mmHg. In (A), the center of the optic nerve head (ONH) was identified at the point where the vertical center (line α) of the ONH met the horizontal center from which the trunk of the central retinal vessels came out from the ONH (line β). In (B), in the horizontal cross-sectional view of the EDI-OCT, the lamina cribrosa thickness (204 µm) was measured along line α, between lines β-1 and β-2. In (C), both the anterior and posterior borders (delineated with white arrows) of the lamina cribrosa were identified in the EDI-OCT.