https://www.youtube.com/watch?v=Ibsrqtx2FD0: Part 1
https://www.youtube.com/watch?v=apVGaDMAId8&feature=youtu.be: Part 2
The eye allows us to see. Light rays reflect off an object and pass through the cornea of our eye, the clear outer covering. The rays pass through the pupil, which is a hole regulated in size by the iris. They then pass through the lens which bends the light onto the back of the eye on the retina. The lens is controlled by the ciliary muscle. These rays are then interpreted by the optic nerve and signals are sent to the brain to tell us what the object looks like.
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