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HUMAN VISION

HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

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Page 1: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

HUMAN VISION

Page 2: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

The Eye

Page 3: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Light

WAVE

PARTICLE

Page 4: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Physics of the Eye’s lens

Page 5: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Parallax Lab

• Although each eye alone gives focus, together, they provide you with depth perception.

How?

Page 6: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Parallax

Page 7: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Light

WAVE

PARTICLE

Page 8: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Rods and Cones

Page 9: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens
Page 10: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Color Spectrum and Photopsin

Cone type Name Range Peak wavelength[1][2]

S (OPN1SW) - "tritan", "cyanolabe" β 400–500 nm 420–440 nm

M (OPN1MW) - "deutan", "chlorolabe" γ 450–630 nm 534–545 nm

L (OPN1LW) - "protan", "erythrolabe" ρ 500–700 nm 564–580 nm

Different opsins differ in a few amino acids and absorb light at different wavelengths as retinal-bound pigments.

Page 11: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Primary Colors Lab

The definition of a “primary color” is that no combination of other colors can be used to make it.

Why is this a bad definition?Given markers and top materials,

experimentally verify all types of primary colors and explain how your results reflect the known properties of photopsin.

Page 12: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Primary Colors of Light and Pigment

Page 13: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Colorblindness

Normal protanopia deuteranopia tritanopia

All three cone types Absence of red receptor

Absence of green receptor

Absence of blue receptor

Page 14: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Humans vs. Animals

Honeybees, bumblebees, and many butterflies

Page 15: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens
Page 16: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens
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Page 18: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

Illusions Lab (Discussion)• Why do you think we

experience the following as optical illusions?

Page 19: HUMAN VISION. The Eye Light WAVE PARTICLE Physics of the Eye’s lens

optical illusions

• http://www.michaelbach.de/ot/• http://www.michaelbach.de/ot/ang_fraser/in

dex.html