SD-OCT volume scans (20°×15° with 19 horizontal sections, ART 9, SD-OCT, Heidelberg Engineering, Heidelberg, Germany) of the macula were obtained for each study eye to measure the central subfield thickness (CST) in µm by using Heidelberg SD-OCT software; significant macular ischemia was ruled out by UWFA. FA images were acquired approximately one minute (arteriovenous phase) and 4–5 minutes (late venous phase) after intravenous injection using the Optos 200T× scanning laser ophthalmoscope (Optos PLC) after standard intravenous infusion of 5 mL of sodium fluorescein (10%) by one experienced technician for all included cases.
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