That part of an image focused on the fovea, a region of the retina near the optical axis of the eye. The fovea has a high density of the color-sensitive receptors known as cones, but it has no rods. Foveal vision permits much higher resolution than does parafoveal vision and is the normal mode of vision under daytime conditions. The vision in the fovea is exclusively photopic while in the parafoveal region it can be either photopic or scotopic. See dark adaptation.