Vision

1
Vision

• Light Stimulus
• Receptor The Eye
• Visual Pathways
• Vision Cortex
• Visual Perception

2
Light

• The Electromagnetic Spectrum
• Photons
• Waves

3
Vision

• The world as it is

4
Vision

• The world as it is

5
Vision

• The world as it is

6
Light

• Refraction
• Reflection
• Absorbtion
• Diffraction

7
The Eye

• Lens
• Retina

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The Eye

• Retina

9
The Eye

• Retina Layers

10
The Eye

• Rods and Cones

11
The Eye

• Rods and Cones
• Here is the distribution of rods and cones in the
  peripheral part of the retina. Rods are small
  green circles cones are large green circles.
  Large yellow circles are cones that respond to
  short wavelengths.

12
The Eye

• Rods and Cones
• Here is the distribution of cones in the fovea.
  Blue are short wavelength Green are medium
  wavelength Red are long wavelength.
• Notice that there are more long wavelength cones.

13
The Fovea
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Rods Cones
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Photo-receptors
16
The Eye

• Lens Accommodation

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The Eye

• Lens
• Corrected Vision

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The Eye

• Lens
• Corrected Vision

19
Lateral Inhibition

• Enhances the perception of contrasts and margins