Anatomy of the eye

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Across
  1. 2. opening at the center of the iris
  2. 3. the colored part of the eye that that regulates the amount of light entering the eye
  3. 5. clear outer part of eye's focusing system
  4. 7. structure that protects the eyeball and helps to keep it moist
  5. 8. clear part of the eye behind the iris that helps to focus light on retina
  6. 9. contains the sensory cells that pick up and convert light into nerve impulses
  7. 10. a gland that produces tears to help keep your eyes moist
  8. 12. a transparent, colorless gel that fills the back 2/3 of the eyeball
  9. 13. a tough protective covering on the outside of the eye
Down
  1. 1. the structure that carries impulses from the retina to the brain
  2. 4. supplies retina with nutrients
  3. 5. this muscle changes the shape of the lens and allows the eye to focus on objects at various distances
  4. 6. a sensory receptor in the retina that senses size, shape, and brightness of visual images and functions best in dim light.
  5. 11. a sensory receptor in the retina that is sensitive to colors and functions best in bright light.