Spectral-domain (SD) -OCT device (Bioptigen Inc. Durham. NC, USA) was used to record the retinal layers thickness [30 (link), 31 (link)]. Images were captured with the rectangular scan at 1000 A-scans per B-scan, and 100 B-scans per frame. Total retinal thickness (TRT) was measured perpendicularly from the layer of retinal nerve fiber layer (RNFL) to the layer of outer segment (OS), 500 μm away from the center of optic nerve head (ONH) using the built-in software (InVivoVU, Bioptigen) and then averaged. The examiners were blinded to the treatment information.
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