The center of the retina is a pit called the . the cells that are photoreceptors (detect color) are . in low light conditions, only rods are activated, and visual acuity is best in the of the eye. in bright light conditions, visual acuity is best when light is focused on the of the eye. a single ganglion cell outside of the fovea receives input from rod(s). each cone synapses with ganglion cell(s).