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THREE-DIMENSIONAL MOTION PICTURES ^ 73 on the two retinas, the sensitive elements of which are individually connected, by means of the nerve strands, to the visual perception center of the brain, often called the cortinal retina. Should these interconnecting nerve strands become severed or diseased, partial or even total blindness results, even if both eyes appear completely normal. In the cortical retina the two images merge and are impinged on the consciousness as a single image instead of two separate and distinct images. This ability of the cortical retina or brain appears miraculous when contrasted with the results obtained when other means are employed to attain the same end—a jumbled, confusing double picture. In the stereoscope two pictures are presented to the eyes under almost identical circumstances, as when Nature is normally observed binocularly. Obviously, the same process of merging two images with identical spatial sensations occurs in the cortical retina. It has been established definitely that the eye possesses only a single spot in the retina where sharp focusing is possible, the fovea lutea, which serves as a scanning device to so sweep a scene as to cause individual sharp imaging of detail. Immediately outside the fovea there is no sharpness of the retinal image. Clearly, then, when viewing a scene one sees only a single detail with great acuity, the surroundings becom ing progressively more hazy with distance from that detail. In fact, by simply concentrating on one object in a scene, everything surrounding that object becomes hazy in outline to the point of non-recognition. The fact that we seem to see the entire scene sharply is due to the very rapid scanning motion of the eye which brings successive details into sharp focus.