The eye

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Across
  1. 3. change in environment that affects an organism
  2. 4. white outer layer of the eyeball
  3. 5. transparent layer forming the front of the eye
  4. 6. device that converts one form of energy into another
  5. 10. layer at back of eyeball containing light-sensitive cells
  6. 11. humour watery fluid supporting cornea and front chamber of the eye (8,6)
  7. 12. adjusting for near and distant objects
  8. 13. sense that depends on mechanical stimulation of the skin
  9. 14. spot exit point of the optic nerve
  10. 16. ligament fibrous membrane that holds the lens of the eye in place (10,8)
  11. 19. 'colour' of the eye
Down
  1. 1. part of the nervous system adapted to receive stimuli
  2. 2. humour jelly like substance that helps keep shape of eyeball (8,6)
  3. 7. ability to respond to stimuli
  4. 8. bending (of light)
  5. 9. area of eye providing maximum sharpness of vision
  6. 15. transparent, biconvex body found behind the iris that focuses light on the retina
  7. 17. opening that lets light into the eye
  8. 18. photoreceptor cells providing black-and-white images