THE EYE

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Across
  1. 5. Protein in rod cells that absorbs light in low-light conditions
  2. 8. Gel-like substance that keeps the eye round and helps focus light
  3. 10. Attaches the lens to the ciliary muscle to help it change shape
  4. 12. Muscle that changes the shape of the lens
  5. 14. Thin membrane covering the front of the eye
  6. 16. Opening in the iris that lets light into the eye
  7. 17. Light-sensitive cells that detect colour
  8. 19. Muscles in the iris that make the pupil bigger in dim light
  9. 21. Carries visual information to the brain
Down
  1. 1. Changes shape to help focus on near or distant objects
  2. 2. Muscles in the iris that make the pupil smaller in bright light
  3. 3. Clear, curved surface that helps focus light into the eye
  4. 4. The spot in the eye with the clearest vision
  5. 6. Protein in cone cells responsible for color vision in bright light
  6. 7. Light-sensitive cells that work in dim light
  7. 9. Tough, white outer layer of the eye that provides shape and protection
  8. 11. Gland that produces tears to clean and moisten the eye
  9. 13. Layer of tissue containing blood vessels that nourish the eye
  10. 15. Clear fluid in the front of the eye that helps refract light
  11. 18. Contains light-sensitive cells called rods and cones
  12. 20. Controls how much light enters the eye