Parts of the eye

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Across
  1. 4. Carries electrical impulses to the visual cortex in the brain
  2. 5. Protects the eyeball
  3. 6. Controls the amount of light that enters the eye
  4. 7. Protective outer layer of the eye
Down
  1. 1. An opening through which the light enters the eye
  2. 2. Receive light and convert it into electrical impulses
  3. 3. Focuses light onto the retina at the back of the eye