1. Light Rays reflect off an object.

2. As the rays enter the eye, the cornea refracts (bends) the rays to focus the image on the retina at the back of the eye.

3. The iris acts like a shutter in a camera. When the light is bright, the iris closes the pupil to allow less light to enter the eye. When the light is dim, the iris opens the pupil to allow more light to enter the eye.

4. Small fibers, called zonules, contract or expand to change the shape of the lens of the eye and fine tune focus, sharpening either near of far vision.

5. The light rays converge and then cross at the focal point near the back of the eye. The inverted image is received by the retina.

6. The retina transmits the image through the optic nerve to the brain. The brain then correctly interprets the image in an upright position.

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