11VisionJK - Vision The Eye 2 Formation of Images on the...

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Unformatted text preview: Vision The Eye 2 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 www.med-ed.virginia.edu/.../MMHndt_Eye.html The human eye www.med-ed.virginia.edu/.../MMHndt_Eye.html Retinal Development Part of diencephalon Optic vesicle Phototransduction Figure 15-48 Molecular Biology of the Cell ( Garland Science 2008) Figure 15-50 Molecular Biology of the Cell ( Garland Science 2008) Sildenafil citrate ( ) cGMP GMP cGMP phosphodiesterase Figure 15-49 Molecular Biology of the Cell ( Garland Science 2008) 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...
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11VisionJK - Vision The Eye 2 Formation of Images on the...

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