Imaging was performed at baseline and at follow-up months 3 , 6 , 9 , and 12 , including autofluorescence ( AF ) imaging with a fundus camera-based flash system ( TRC-50DX ; Topcon Medical Systems , Oakland , NJ ; AF excitation : 535-585 nm ; detection : 605-715 nm ) , AF and fluorescein angiography ( FA ) imaging with a confocal scanning laser ophthalmoscopy ( SLO ) system ( Spectralis ; Heidelberg Engineering , Heidelberg , Germany ; AF excitation : 488 nm ; detection : > 500 nm ) , and SD-OCT en face imaging ( Cirrus ; Carl Zeiss Meditec , Dublin , CA ) .