22.3. Vision http://www.ck12.org
22.3 Vision
Lesson Objectives
- Describe the structure and function of the eye.
- Explain how the eyes and brain work together to enable vision.
- Identify common vision problems and how they can be corrected.
Introduction
A certain optical instrument uses a convex lens to focus an image on a surface, where the image is encoded in
electrical signals. The signals are then transmitted to an extremely fast and complex computer, which interprets the
signals as an image. Can you guess what the optical instrument is? The “instrument” is the human eye. And the
“computer”? It’s the human brain. In this lesson, you’ll learn how the eyes and brain work together to enable human
vision.
Structure and Function of the Eye
The structure of the human eye is shown inFigure22.24. Find each structure in the diagram as you read about it
below.
FIGURE 22.24
The human eye is the organ specialized
to collect light and focus images.