Across
- 3. nerve that connects eyes to brain
- 5. white part of the eye
- 8. layer of photosensitive cells
- 9. colorful opening in eye that changes size
Down
- 1. black hole in eye that lets light in
- 2. neuron that detects colors
- 4. neuron that detects light
- 6. clear outer covering of eye
- 7. clear part of eye that focuses light