So let's begin by looking at the diagram of our eye. So if we examine the eye from a side view and we take a cross section, we get the following diagram. So let's go through each one of these individual structures of the eye and discuss what their function is. And let's begin with the outside most portion of the eye known as the sclera. So the square begins here, it extends all the way around the eye and ends here. It's basically this inner white portion here.