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

angle axis bacillary layer binocular eye binocular perspective binocular vision camera central spot ciliary muscle circle colors combined images cornea corresponding points cross depth of space distant objects distinct divergence double images evident exactly Experiment external images farther fibers field of view finger foreground gaze Helmholtz heteronymous homonymous horizontal horopter horopteric line identical points impression inches inclination interocular space inverted jects law of corresponding left eye left-eye image lens light line of sight look median line middle motion muscles naked eyes nearer nose oblique observer ocular optic axes optic centers optic chiasm optic convergence optic nerve outward parallel perceived perfect image perfectly point of sight position projection pupil ray-lines rays refractive represent retina retinal images right and left right eye right-eye image rotation sclerotic screen seen single shut side stereoscope surface tion torsion true turn the eyes vertical meridian vibrations visual lines visual result vitreous humor