How do people see?

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Across
  1. 3. to take something apart
  2. 5. the clear layer in front of the eye
  3. 6. what makes it possible to see things
  4. 9. the colored part of the eye that is shaped like a donut
  5. 10. a pretend version of something that scientists use
Down
  1. 1. changes the direction of light as it passes through
  2. 2. the ability to see
  3. 4. a test used to discover new information
  4. 7. the back of the eye that senses light and sends messages
  5. 8. the dark opening in the center of the eye