The iris has a job as well. It opens and closes to let different amounts of light into your eye. It is also responsible for the color of your eyes. The two pieces that help your eyes see are the rods and cones. Rods and cones can see two different colors.
Rods see black and white, and cones see in color.
The brain is what combines both images, so that you see all colors. Other parts of the eye carrying significance are the lateral rectus, medial rectus, superior rectus, inferior rectus, inferior oblique and superior oblique. Each one of these has a job. Lateral rectus moves the eye vertically. Medial rectus moves the eye medially.