lecture_16 - Photoreception Lens Retina Colour vision...

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Photoreception Lens Retina Colour vision
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Vertebrate eyes Lens focuses light on the retina Changes in shape of lens change the focal length, so focus light from different distances (accomodation) See Fig. 7.35/ 6.35 and 7.36/ 6.36
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Evolution of eyes http://en.wikipedia.org/wiki/Evolution_of_the_eye Kutschera and Niklas 2004 Naturwissenschaften 91:255–276
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Eye structure Layer of photoreceptor cells = retina Fig. 7.35/ 6.35
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Orientation of retina Rods and cones are arranged “backwards” Vertebrate vs. Cephalopod Fig. 7.37/ 6.37
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Retina Fovea Blind spot See also http://www.yorku.ca/eye/blndspot.htm
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Signal processing in the vertebrate retina Convergence Receptive fields of ganglion cells the area of retina from which a ganglion cell receives signals Fig. 7.38/ 6.38
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Colour vision More than one kind of photopigment is present the cones of some species E.g., short, medium, long wavelength cones Different photopigments are maximally stimulated by different wavelengths – can be used to distinguish colours Fig. 7.42/ 6.42
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This note was uploaded on 11/05/2011 for the course BISC 305 taught by Professor Christians during the Fall '11 term at Simon Fraser.

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lecture_16 - Photoreception Lens Retina Colour vision...

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