Sight: An Exposition of the Principles of Monocular and Binocular Vision

adjustment already angle appearance becomes binocular binocular vision brought called central spot circle clear colors combined complete condition cones convergence corresponding points course cross defect diagram direction distance distinct double images evident exactly experiment explained external extreme fact fall farther fibers field of view figures front give greater horizontal Illustrations impression inches inclined kind layer left eye lens less light look median middle motion move natural nearer necessary normal nose object observer opposite optic axes outward parallel pass perceived perception perfect perfectly persons perspective phenomena plane point of sight position primary produce projection rays referred regarded represent result retina retinal images right eye rotation screen seen sense shown side single space stereoscope structure surface theory tion true turn unite vertical vision visual lines wall whole