The eye

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Across
  1. 1. Transparent, biconvex body found behind the iris that focuses light on the retina
  2. 4. Jelly-like substance that helps keep shape of eyeball (8,6)
  3. 7. White outer layer of the eyeball
  4. 8. Opening that lets light into the eye
  5. 9. Exit point of the optic nerve (5,4)
  6. 10. Ability to respond to stimuli
  7. 11. Photoreceptor cells providing black-and-white images
  8. 13. Transparent layer forming the front of the eye
  9. 14. Adjusting for near and distant objects
  10. 16. Area of eye providing maximum sharpness of vision
  11. 17. Sense that depends on mechanical stimulation of the skin
  12. 19. Bending (of light)
Down
  1. 2. Change in environment that affects an organism
  2. 3. Fibrous membrane that holds the lens of the eye in place (10,8)
  3. 5. Device that converts one form of energy into another
  4. 6. Part of the nervous system adapted to receive stimuli
  5. 12. Part of eye containing photoreceptor cells
  6. 15. Watery fluid supporting cornea and front chamber of the eye (8,6)
  7. 18. 'Colour' of the eye