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The Visual System: The Nature of Light

The Visual System: The Nature of Light. Electromagnetic Energy. An energy spectrum that includes X-rays, radar, and radio waves A small portion of the spectrum includes light visible to the human eye Light can be described as both a particle and a wave. White light. Prism. Visible light.

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The Visual System: The Nature of Light

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  1. The Visual System: The Nature of Light

  2. Electromagnetic Energy • An energy spectrum that includes X-rays, radar, and radio waves • A small portion of the spectrum includes light visible to the human eye • Light can be described as both a particle and a wave

  3. White light Prism Visible light 400 500 600 700 Ultra- violet rays Broadcast bands AC circuits Gamma rays Infrared rays X-rays Radar 10 10 10 10 10 10 10 10 10 10 10 10 13 15 11 17 9 5 1 3 7 -1 -5 -3 Wavelength in nanometers (billionths of a meter) Electromagnetic Spectrum of Light

  4. Hue • Hue is the color of light as determined by the wavelength of the light energy • Includes: red, orange, yellow, green, blue, indigo and violet (ROY G. BIV) • The eye can detect 7 million separate hues

  5. Amplitude • The brightness of light as determined by height of the wave • The taller the wave, the brighter the color

  6. The Visual System: The Structure of the Visual System

  7. Vision Purpose of the visual system • Transduction: transform light energy into an electro-chemical neural response (action potential & synaptic transmission) • represent characteristics of objects in our environment such as size, color, shape, and location

  8. Parts of the Eye – Cornea

  9. Cornea • The clear bulge on the front of the eyeball • Begins to focus the light by bending it toward a central focal point • Protects the eye

  10. Parts of the Eye - Iris

  11. Iris • A ring of muscle tissue that forms the colored portion of the eye; creates a hole in the center of the iris (pupil) • Regulates the size of the pupil by changing its size--allowing more or less light to enter the eye

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