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Across 4. a clouding of lens due to age 5. transparent, front part of the eyeball that bends light 6. membrane at the back of the eye containing the rods and cones 11. tough white outer membrane 13. muscles that move the eyes in all directions (pl, 2w) 17. a doctor to consult for an eye condition 18. name of the specialized light receptors of the retina (pl.) 19. changes shape so the eye can focus on objects near and far 20. an opening that allows light to enter the inner eye 21. conjunctivitis

Down 1. name of the specialized colour receptors of the retina (pl.) 2. muscle that controls the amount of light entering the eye 3. a condition when rods and cones degenerate with age (2w) 4. when the pupil is very narrow to allow minimum light in 7. the fluid filling the posterior chamber of the eye (2w) 8. a condition where internal pressure damages the optic nerve 9. the fluid filling the anterior chamber of the eye (2w) 10. a specialist who prescribes glasses 11. an infection of the sebaceous glands of the eyelid 12. a condition when the cornea is misshaped 14. membrane containing nourishing blood vessels 15. helps to keep dust out of the eye (pl.) 16. when the pupil is wide open to allow maximum light in