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The retina has two types of cells used in vision, rodsand cones. Cones, concentrated in the center of the retina, serve both color vision and the highest visual acuity. Rods, concentrated away from the center -- at the "sides," as you phrased it -- are responsible for night vision, for our most sensitive motion detection, and for our peripheral vision (vision of objects to the side, away from the center). Paradoxically, your night-vision is enhanced it you do not look directly at objects that are in relative darkness. If you drive at night on poorly lighted roads, for example, you can enhance your night-vision of passing cars and of the sides of the road by looking straight ahead: the rods will detect motion, objects on the periphery (the sides), and objects in relative darkness. If you were to look directly at objects in darkness, you would be stimulating the cones, in the center of the retina, and your night-vision would be less effective.

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17y ago

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