1.45. How the Eye Works http://www.ck12.org
Summary
- Light entering the eye is focused by the lens on the retina, which sends messages to the brain through the optic
nerve. - Muscles in the eye control the shape of the lens so the light is focused on the back of the eye no matter how
far the object is from the lens.
Practice
Use the resource below to answer the questions that follow.
- Anatomy and Function of the Eyeat http://www.youtube.com/watch?v=RE1MvRmWg7I (2:00)
MEDIA
Click image to the left for more content.- What are the three layers of the eye? Which one acts to maintain the eyes shape?
- Where does light enter the eye? How is the amount of light entering the eye controlled? Why is it valuable to
organisms to control how much light enters the eye? - What structure contains the rods and cones in the eye? Where are they located?
Review
- Outline the path of light through the eye.
- Describe the role of the lens of the eye.