11Vision - Vision The Eye Formation of Images on the Retina...

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Unformatted text preview: Vision The Eye Formation of Images on the Retina Cornea Lens Accommodation Pupil Constriction reduces spherical and chromatic aberration Increases depth of field Limits amount of light, reducing acuity Focus on the Fovea Retinal Development Part of diencephalon Optic vesicle Phototransduction Amplification 1 photon:200 channels :1 mV V m Sensory Adaptation Arrestin As channels close, Ca 2+ levels drop, leading to decreased sensitivity to light Decrease Ca 2+--> increase GC activity Decrease Ca 2+--> increase rhodopsin kinase activity --> arrestin binding Decrease Ca 2+--> increased affinity of channels for cGMP Specialization of Rod and Cone Systems Rod and Cone Systems Rod system Low spatial resolution High sensitivity B&W Cone system High acuity Relatively low sensitivity Color (in some organisms) Rods and Cones Rods Respond reliably to a single photon of light More inclined to saturate (fail to reset)...
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11Vision - Vision The Eye Formation of Images on the Retina...

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