Label the parts of the Eye 1. The ________________ of the eye focus the light emitted by the objects in the world onto the ________________ at the back of the eye. 2. The retina contains light sensitive cells which convets ________________ to ____________________. 3. A network of _____________collects visual information and transmits it down the _________ ________ to the brain. 4. Light is focused by two lenses, a fixed lens, the _____________, and a flexible ____________. 5. The shape of the flexible lens is changed by the donut shaped ___________________ ______________. 6. When the ______________ muscles are contracted, the lens becomes more _____________and a _______ object is focused on the _____________. 7.When the _____________ muscles are relaxed, the lens becomes more ____________ and a ____________________object is focused on the ______________. 8. The ability to focus on an image depends on what two factors? 9. Which conditions produce near-sightedness? 10. Which conditions produce far-sightededness? 11. A person who is near sighted needs what type of lens? 12. A person who is far sighted needs what type of lens? 13. When lighting is bright what happens to the iris of the eye? 14. How can the iris improve the focus of an image on the retina? 15. Put the following description of the process of sight in order- The Process of Seeing a. Nerve impulses are generated which travel along the optic nerve to the brain b. Photo receptor cells in the retina are stimulated c. The occipital, temporal and parietal lobes of your brain process visual information d. The light rays are bent by your lens e. Light rays reflected from the tree enter your eye through your pupil f. Your lens focuses an upside down image of the tree on your retina g. Eyes focus on the tree. |
SIGHT