The eye is our organ of sight. We use our eyes in reading, working, watching TV and movies, playing games, and innumerable more activities.
The human eyeball measures only about an inch in diameter, yet the eye can see objects as far away as a star and as tiny as a grain as sand. Our eyes can quickly adjust its focus from distant objects to ones nearby. It can even be accurately directed toward a certain point even while our heads are moving.
Our eyes don’t actually see objects. It sees the light they reflect or give off….pretty weird if you think about it. Light rays enter our eyes through transparent tissue. Our eyes change the rays into electrical signals and those signals are then sent to our brain, which interprets them as visual images. What if we really are in The Matrix? Hm…
Structure
Each eyeball is set in a protective cone-shaped cavity in the skull. This cavity is called the orbit or socket. Its ridges form our brow and cheekbones. Fatty tissue inside the orbit surrounds our eye ball and cushions it against blows (“black eyes”). The soft tissue also enables our eyes to turn easily in orbit. Six muscles move our eyeball very similarly to the way the strings move a puppet.