The pupil is the opening in the iris, and the lens focuses light on the retina. The retina is the light-sensitive layer of cells at the back of the eye. Photoreceptors are neurons that absorb light and convert it into neural responses. The fovea, a structure in the center of the retina, contains nothing but densely packed cones, and is the area of sharpest vision. Bipolar cells are nerve cells that combine impulses from many bipolar cells into a single firing rate.
Ganglion cells integrate impulses from many bipolar cells into a single firing rate.
The axons of the ganglion cells contain nerve fibers that, bundled togehter, make up the optic nerve, which carries visual information from the eye to the brain. Pathways to the brain. The visual cortex is part of the occipital lobe that processes information received from the eyes. Color Vision Dimensions of Color Hue is the dimension that captures the essential color of a light in terms of the wavelength entering the eye. Saturation is the psychological dimension that captures the purity and vividness of color sensations.