The eye, a sphere with an average diameter of 24mm, like a ping-pong ball, is one of the most complicated organs in our body.
Our eyes sit in the anterior part of the bony sockets called the bulbus oculi in our skull. They take up less than 1/3 of the total space and are surrounded by pads of fat and muscles, which accounts for the remaining 2/3.
The socket is made up of 7 pieces of bone. It has a volume of ~ 30ml while the eye's volume is 7ml. It is a protective structure because its rim extends beyond the plane of our eye, decreasing the damage done by direct impact if an object hits on our face.
The eye's spherical shape permits easy rotation and is also for receiving amount of light from different angles. (see retina)