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The Human Body

The Human Body. Chapter Twenty: Vision and Hearing. 20.1 The Nervous System 20.2 Color Vision 20.3 Light and Images 20.4 Hearing. Investigation 20A. Color Vision. How do our eyes see color?. 20.2 Vision. Every time you see something, light is involved.

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The Human Body

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  1. The Human Body

  2. Chapter Twenty: Vision and Hearing • 20.1 The Nervous System • 20.2 Color Vision • 20.3 Light and Images • 20.4 Hearing

  3. Investigation 20A Color Vision • How do our eyes see color?

  4. 20.2 Vision • Every time you see something, light is involved. • Light rays in the room reflect off the page and into your eyes. • The reflected light carries information that allows your brain to form an image of the page.

  5. 20.2 How the eye works • The eyeis the sensory organ used for vision. • The retina contains light-sensitive cells called photoreceptors. • Photoreceptors convert light into nerve impulses that travel through the optic nerveto the visual cortex of the brain.

  6. 20.2 How the human eye sees color • Light is part of a range of waves called the electromagnetic spectrum. • Coloris how we perceive the energy of light.

  7. 20.2 How the human eye sees color • Our eyes have two types of photoreceptors: cone cells and rod cells. • Cone cellsrespond to color. • Rod cells detect black, white, and shades of gray.

  8. 20.2 How color is perceived • Our eyes work according to an additive color process— three photoreceptors (red, green, and blue) in the eye operate together so that we see millions of different colors.

  9. 20.2 Colorblindness • A condition called color blindness affects about 8% of males and 0.4 % of females. • People who are color blind have trouble seeing certain colors. • The most common condition is red-green color blindness.

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