Table 1.

Distribution of microglia and macrophages in retinal layers.

Location	NFL	GCL	IPL	INL	OPL	ONL	PR	SS	RPE	CHD	SCL
Vascular network	X	X	X	X						X	X
Early MG	X	X
Adult MG	X	X	X	X
Inflammation
MG	X	X	X	X	X	X	X	X
Macrophages	X	X						X	X	X

Key: MG: microglia; OPL: outer plexiform layer; ILM: inner limiting membrane; ONL: outer nuclear layer; NFL: nerve fiber layer; PR: photoreceptor layer; GCL: ganglion cell layer; SS: subretinal space; IPL: inner plexiform layer; RPE: retinal pigment epithelium; INL: inner nuclear layer; CHD: choroid; and SCL: sclera.

Based on findings from human, primate, rats, mice, and quail retinas. Adapted from Boycott and Hopkins, 1981, cited by Chen et al., 2002 [10], Santos et al., 2008 [11], Cuadros and Navascués, 1998 [12], and Tan et al., 2012 [13]