Violet is just another word for purple, right? Not quite. The colors may look the same, but in terms of physics, they're totally different.
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Nearly 70% of all the sensory receptors in your whole body are in your eyes. Nearly half of the cerebral cortex is involved in vision. 00:48
Light hits your posterior retina and spreads from the photoreceptors to the polar cells to the innermost ganglion cells. The ganglion cells form the optic nerve, which carries visual impulses to the thalamus and onto the brain's visual cortex. 05:43
Cones detect fine detail and color, and can be divided into red, green, and blue types, depending on how they respond to different types of light. Rods are more numerous and light sensitive, but they can't distinguish color. Rods rule your peripheral vision. 06:11