vision of fish by andrew mcdonald

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Vision of Fish By Andrew McDonald www.yahoo.com

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Outline Introduction Challenges of water Absorption of light Refraction of light Anatomy of eye Light regulation Jim Lavarakas

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Page 1: Vision of Fish  By Andrew McDonald

Vision of Fish

By Andrew McDonaldwww.yahoo.com

Page 2: Vision of Fish  By Andrew McDonald

Outline

• Introduction• Challenges of water• Absorption of light• Refraction of light• Anatomy of eye• Light regulation

Jim Lavarakas

Page 3: Vision of Fish  By Andrew McDonald

IntroductionOptics : the collection of light and formation of an

image by the lens

www.haroldcheck.com

Accommodation : focusing of images on the retina

www.yahoo.com

Page 4: Vision of Fish  By Andrew McDonald

Eyes of Fish• Much like

human eyes• But no eye lids• Many sizes and

colors

www.yahoo.com

www.ebiomedia.com

Page 5: Vision of Fish  By Andrew McDonald

Anatomy of Eye• Sclera• Cornea• Lens• Iris• Retina• Optic nerve

Page 6: Vision of Fish  By Andrew McDonald

Powerful Eyes• Spherical lens

• High refractive power

• High quality

• Receptors: cones and rods

www.yahoo.com

www.appstate.edu

Page 7: Vision of Fish  By Andrew McDonald

Problems With Seeing Problems With Seeing Under WaterUnder Water

• Suspended particles

• Light absorption

www.yahoo.com

www.yahoo.com

•Light refraction

www.yahoo.com

Page 8: Vision of Fish  By Andrew McDonald

Suspended Particles

• Sediments• Microorganisms• Plant growth• Fast-moving

waterwww.hurleywi.com/ what_to_do/default.asp

Page 9: Vision of Fish  By Andrew McDonald

Light Absorption

• The dimming of light as it passes through water

• Red wavelengths absorbed rapidly

• Blue wavelengths absorbed slowly

• Deep ocean is blue

www.google.com

www.rainbows.com

Page 10: Vision of Fish  By Andrew McDonald

Light Refraction• Cone of Vision

• Water bends 48.6 degrees

• Freshwater pools

• Snell’s window

Snell’s window

Page 12: Vision of Fish  By Andrew McDonald

Light Regulation• For more light:

• Mirrors in back of eye

• Larger eyes• Swim toward light

www.google.com

Walleye

Page 13: Vision of Fish  By Andrew McDonald

Conclusion

• Some similarities w/ humans

• Different environments

• More obstacles• More diverse• Altered behaviors