Optical Nerve is the nerve of sight which goes from the brain to the eye. The cornea is the clear part of the outer part of the eye. The cornea covers the iris and the pupil. Rods are microscopic sence organs in the retina of the eye that are sensetive to dim light. Cones are coned shaped cells of the retina that respond to light.
Receptors are cells in the retina that perceive light.
ROY G BIV stands for the colors in the rainbow. It stands for Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Primary colors are the three colors that make up all other colors. There are 2 different sets, one for light and one for pigment. The primary colors for light are Cyan, Magenta, and Yellow.