The eye

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Across
  1. 2. The medical term for short-sightedness (6)
  2. 3. The tough supporting wall of the eye (6)
  3. 6. The medical term for long-sightedness (9)
  4. 7. The pathway of information from a sensory neuron through a relay neuron in the spinal cord to a motor neuron (6,3)
  5. 8. Something that sets off a reaction in the nervous system. (8)
  6. 10. The hole in the middle of the eye. (5)
  7. 11. This focuses the light onto the retina. (4)
  8. 13. These work with the ciliary muscles to control the shape of the eye. (10,9)
  9. 14. These muscles contact in dim light (6)
  10. 15. When the eye focuses light on the retina by changing the shape of the lens (12)
  11. 17. These muscles contract in bright light. (8)
Down
  1. 1. These work with the suspensory ligaments to control the shape of the eye. (7,7)
  2. 4. to alter the direction (of a light wave). (7)
  3. 5. (the part of the brain that controls balance and co-ordination (10)
  4. 9. The part of the brain controlling breathing, heart rate and peristalsis (7)
  5. 12. The part of the eye that contains muscles allowing it to contol the diameter of the pupil (4)
  6. 16. The transparent outer layer found at the front of the eye, that refracts light into the eye (6)