1. The Eye

2. The Pupil  A small adjustable opening.  Its size and the amount of light entering the eye is regulated by the iris.

3. Iris  A ring of muscle tissue that forms the colored portion of the eye around the pupil.  Controls the size of the pupil opening.

4. Lens/Accommodation  The lens is the structure behind the pupil that changes the shape to help focus the images on the retina.  Accommodation is the process by which the eye’s lens changes shape to focus near or far objects on the retina.

5. Acuity  The sharpness of vision

6. Nearsightedness/Farsightedness  Nearsightedness is a condition where you see nearby objects more clearly than distant objects because distant objects focus in front of the retina  Farsightedness is a condition where you see far away objects more clearly than near objects because the image of near objects is focused behind the retina.

7. Retina  The Retina is the light-sensitive inner surface of the eye; it contains the receptor rods and cones plus layers of neurons that begin the processing of visual information.

8. Rods/Cones  Rods are Retinal receptors that detect white, black, and gray.  Cones are receptor cells that are concentrated near the center of the retina and that function in the daylight or in well- light conditions.

9. Optic Nerve Optic Nerve  The nerve that carries neural impulses from the eye to the brain.