The eye

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