The capillary circulation in the posterior pole was studied by fluorescein angiography and silicone rubber injection in eight species of primates. Six of these were diurnal monkeys: marmoset, squirrel moneky, capuchin monkey, black spider monkey, African green monkey, and rhesus monkey. In these diurnal species, the retinas have both rods and cones, and there is a central region free of capillaries that corresponds to the fovea, just as in the human retina. In two nocturnal species, the bushbaby and the owl monkey, both of which lack a fovea, there is no central capillary-free zone.
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