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Across 2. Structure above the eye which prevents debris from falling into the eye socket 3. Layer of the eye highly pigmented with melanin to absorb light 6. Tough outer layer of the eye which gives it shape and anchors eye muscles 8. Area in center of macula with sharpest vision 9. Cells of the retina which absorb light 10. Epithelial membrane lining the inner eyelid and surface of the eye 11. Tissue which removes foreign debris and moisturizes the eye when blinking 14. Colored portion of the eye, surrounding the pupil 15. Cells of the retina which sends nerve impulses to the optic nerve 17. Ring of smooth muscle anchoring the lens 19. The bending of light passing from one transparent region to another 20. The lens becomes more ______ when viewing close objects 21. Area where optic nerve leaves the eye, blind spot 22. Photoreceptors function in bright light to see color 23. Region of the retina with high concentration of cones

Down 1. Photoreceptors function in dim light to see shades of grey 2. Hairs lining the edge of the eyelid 3. Both eyes focusing on the same object 4. Bending of the lens to focus on objects both close and at a distance 5. Biconcave structure which focuses light entering the eye 7. System of glands and ducts which produce and distribute tears 10. The pupil _______ to limit light entering the eye 12. Cells of the retina which generate an action potential 13. The lens becomes more ______ when viewing distant objects 16. Structure of the eye which causes light to bend into the posterior portion 18. Anterior, transparent portion of the eye