Vision of Fish www.yahoo.com By Andrew McDonald.

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Presentation transcript:

Vision of Fish www.yahoo.com By Andrew McDonald

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

Introduction Optics : 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

Eyes of Fish Much like human eyes But no eye lids Many sizes and colors www.yahoo.com www.ebiomedia.com

Anatomy of Eye Sclera Cornea Lens Iris Retina Optic nerve

Powerful Eyes Spherical lens High refractive power High quality Receptors: cones and rods www.appstate.edu www.yahoo.com

Problems With Seeing Under Water Light refraction Suspended particles Light absorption www.yahoo.com www.yahoo.com www.yahoo.com

Suspended Particles Sediments Microorganisms Plant growth Fast-moving water www.hurleywi.com/ what_to_do/default.asp

Light Absorption The dimming of light as it passes through water Red wavelengths absorbed rapidly Blue wavelengths absorbed slowly Deep ocean is blue www.rainbows.com www.google.com

Light Refraction Snell’s window Cone of Vision Water bends 48.6 degrees Freshwater pools Snell’s window

Light Regulation To limit light Iris contraction Smaller eyes Migration of visual cells Cornea filter pigments Swim away from light

Light Regulation For more light: Walleye Mirrors in back of eye Larger eyes Swim toward light www.google.com

Conclusion Some similarities w/ humans Different environments More obstacles More diverse Altered behaviors