Vision Crossword Puzzle

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Across
  1. 1. clear layer covering the front of the eye that protects it from infections
  2. 3. takes signals from the eyes to the brain
  3. 5. states that the retina only has three different color receptors for red, green, and blue; a combination of these can produce other colors
  4. 8. detect black, white, and gray light
  5. 10. central point of the retina that creates the sharpest vision and greatest color differences
  6. 11. clear structure that changes shape to focus images on the retina
  7. 12. location where the optic nerve leaves the eye, has no cells that allow for vision
  8. 13. inner surface of the eye that takes in light and begins understanding visual info using rods and cones
Down
  1. 2. proposes that one color of a pair of colors suppresses the other color
  2. 4. ring of muscle that makes up the colored part of the eye around the pupil and controls the size of it
  3. 6. detect colors, fine detail, and well-lit conditions
  4. 7. condition where someone finds it hard to tell the difference between two colors (i.e. red & green)
  5. 9. opening in the center of the eye which changes size depending on how much light enters