Cones are the photoreceptor cells that respond to color vision, i.e the light of different colors.
They are the photoreceptor cells in the retina of the vertebrates.
Rod cells work the best in dim light.
Blind spot is a small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head)within the retina.
Fovea is a tiny pit located in the macula of the retina that provides the clearest vision of all.