Visual apparatus Visual pathway Cortical visual fields
Visual apparatus Visual pathway Cortical visual fields
Visual apparatus Visual pathway Cortical visual fields
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The Photoreceptors:PHOTOTRANSDUCTION• Rods and cones contain photopigments- chemicalsthat release energy when struck by light.Photopigments consist of 11-cis-retinal(derivative of Vitamin A) which is bound to opsin (aprotein).Light converts 11-cis-retinal to all-trans-retinal,which ultimately activates 2 nd messenger systems thatwork to close Na+ channels, hyperpolarizing thereceptor.