Eyeball Anatomy

2. a circular opening that allows light to enter the eyeball
6. blinking is an example
8. a bundle of fibers that carries visual information
9. 120 million of these; the cells in the retina that allow you to see light or darkness
10. the watery liquid behind the cornea that inflates the eyes and nourishes it
11. 7 million of these; the cells in the retina that allow you to see color
14. layer of the eye between the sclera and the retina
16. hollow area in the skull for the eyeball
18. what you see is upside down inside the eyeball
20. a tranparent curved strcuture that focuses light onto the retina

1. chamges the shape of the lens in order to help focus at various distances
3. a ring of muscle that expands and contracts and adjusts the size of the pupil
4. where the optic nerve meets the retina
5. the tranparent gel that fills out the center cavity onthe eyeball
7. organ of vision
12. the white part of your eye
13. number of muscles attached to the sclera
15. The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain
17. the clear protective cover of the eyeball
19. the part of the eye that protects the cornea