Sight

Sight

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Credit: JACOPIN/SCIENCE PHOTO LIBRARY

Caption: SIGHT The eye and the sight. The image visualized (here, a pencil) is refracted by the lens and the cornea on the retina. The retina (zoom) is constituted of three types of neurons placed in layers (photoreceptors, bipolar neurons and ganglion cells). The photoreceptors consist of rods, light sensitive, and the cones, allowing the vision of colors. The macula (or yellow spot) is located at the centre of the retina. It consists of a centralis fovea, the fovea, contening only cones, so that it is the point where the visual acuity is maximal and the one on which occurs the acute vision of the details (place of best resolution). An hypermetropic eye and a myopic eye (drawings on black background) are represented on the right. Far-sightedness causes the formation of the image at the back of the retina, which induces a fuzziness of the nearsighted vision. Far-sightedness leads to the formation of the image in front of the retina which induces a fuzziness of the farsighted vision. See. the image 1189405 for the drawing of the eye alone, 1155405 for the drawing of the retina, 1209105 for far-sightedness and 1208905 for shortsightedness.

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Keywords: anatomy, artwork, cornea, disorder, eye, eyeball, fovea, health, hypermetropia, lens, macula, macula luteae, medicine, nervous system, ophthalmology, pencil, peripheral nervous system, photoreceptor, plain background, refraction, retina, retinal, science, sciences, senses, shortsightedness, sight

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