Rods and cones in retina: colorized scanning electron micrograph (SEM) of rods and cones, showing the structure of the eye retina. Rods (green) are long nerve cells which respond to dim light, enabling images to be detected. Cones (blue) are shorter cone-like cells which detect colour. Rods and cones pass visual signals through the optic nerve to the brain. Pigment cells block light from passing further. Magnification: unknown.

Rods and cones in retina: colorized scanning electron micrograph (SEM) of rods and cones, showing the structure of the eye retina. Rods (green) are long nerve cells which respond to dim light, enabling images to be detected. Cones (blue) are shorter cone-like cells which detect colour. Rods and cones pass visual signals through the optic nerve to the brain. Pigment cells block light from passing further. Magnification: unknown.

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Visual pathway, from the eye back to the visual cortex, in the occipital lobe, in the back of the brain.

Visual pathway, from the eye back to the visual cortex, in the occipital lobe, in the back of the brain.

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Extra-ocular muscles that participate in the vestibular ocular reflex (VOR). These muscles are paired with the semi-circular canals of the vestibular system to allow the eyes to maintain stabilized during slow movements of the head.

Extra-ocular muscles that participate in the vestibular ocular reflex (VOR). These muscles are paired with the semi-circular canals of the vestibular system to allow the eyes to maintain stabilized during slow movements of the head.

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Superior view of the brain revealing the visual pathway and superior sagittal sinus. Electrical nerve impulses travel from the eyes to the occipital lobe in the back of the brain via millions of nerves fibers that make up the visual pathway.

Superior view of the brain revealing the visual pathway and superior sagittal sinus. Electrical nerve impulses travel from the eyes to the occipital lobe in the back of the brain via millions of nerves fibers that make up the visual pathway.

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Color does not exist in nature. At least it does not exist in nature in the form the untutored brain thinks. Visible light consists of continuously varying wavelengths, with no intrinsic color in it. Color vision is imposed on this variation of wavelengths by the photosensitive cone cells of the retina, and the connecting nerve cells of the brain.

Color does not exist in nature. At least it does not exist in nature in the form the untutored brain thinks. Visible light consists of continuously varying wavelengths, with no intrinsic color in it. Color vision is imposed on this variation of wavelengths by the photosensitive cone cells of the retina, and the connecting nerve cells of the brain.

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