Anatomy of the Eye

2. _______ nerve is the nerve that transmits visual information from the retina to the brain.
3. A vision condition where nearby objects are seen clearly but distant objects appear blurry.
5. A transparent, flexible structure behind the iris that focuses light rays.
7. To become larger or wider.
9. The tough, white outer layer of the eyeball.
11. _______ humor is the clear, watery fluid found in the front chamber of the eye between the cornea and the lens.
12. _______ glands are glands located above each eye that produce tears to lubricate and protect the eye.
15. A vision condition where distant objects are seen more clearly than nearby objects.
16. Photoreceptor cells in the retina that detect color.
18. _______ spot is an area on the retina where the optic nerve exits the eye; there are no photoreceptor cells, so no image is detected.
19. The colored part of the eye that controls the size of the pupil to regulate the amount of light entering.
20. The bending of light as it passes through different materials, such as the cornea and lens, to focus on the retina.

1. _______ humor is the clear, gel-like substance that fills the space between the lens and the retina, helping to maintain the eye’s shape.
4. The light-sensitive layer at the back of the eye where images are formed and photoreceptors (rods and cones) are located.
6. A movable fold of skin that protects the eye and helps spread tears over the surface.
8. The black circular opening in the center of the iris that controls how much light enters the eye.
10. Short, curved hairs growing from the edges of the eyelids that protect the eye from debris.
13. The transparent front part of the eye that covers the iris and pupil and helps focus light.
14. Photoreceptor cells in the retina that detect black, white, and shades of gray.
16. To become smaller.
17. _______ muscle is a ring of smooth muscle that changes the shape of the lens to help the eye focus on objects at different distances.