THE EYE-SIGHT

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Across
  1. 4. Electrical signals travel to the brain through the ________ nerve.
  2. 6. Retina has nerve ___________ that send electrical signals to the brain.
  3. 7. The back part of the eye: ___________
Down
  1. 1. Light enters the eye through the ________ and pupil.
  2. 2. The place where the retina meets the optic nerve. __________
  3. 3. What part of the eye focuses the light? __________
  4. 5. What controls the amount of light entering the eye? __________