Physiology of Eye | Walds visual cycle | Phototransduction | Rods and cones | Hyperpolarization
#visualcycle #rodsandcones
Physiology of Eye | Walds visual cycle | Structure of eye | Rods and cones | Hyperpolarization
The processing of visual information begins in the retina with the detection of light by photoreceptor cells. In humans, two specialized types of photoreceptors detect light under different conditions. Rod photoreceptors are highly sensitive and mediate vision in dim light, while cone photoreceptors function in bright light and mediate both high acuity and color vision. To detect light, both rods and cones exploit the unique properties of 11-cis retinal, a photosensitive derivative of vitamin A. The 11-cis retinal in photoreceptors is covalently bound to an opsin signaling protein to form a visual pigment molecule.
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