Lateral rectus moves the eye vertically. Medial rectus moves the eye medially. The superior rectus rolls the eye upward, while the inferior rectus rolls the eye downward. The inferior oblique turns the eye laterally, and the superior oblique turns the eye to each side. Working together these parts help you see.
Depth is a very important topic as well when discussing the eye.
You have spaces between your eyes. Due to that, your eyes see two different worlds. Now, because each eye is seeing two different worlds, the brain must combine the images the eyes take in, so that what you are seeing is not blurry. For further understanding of depth, go to the experiment section. The view of light is probably the most complex sensory system of the body.