Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
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Página 22
... observer looks through the pupil into the dark interior of the ball . The function of the pupil is to admit , and at the same time regulate the amount of , light . 4. Linings . Thus much is visible to the naked eye without dissection ...
... observer looks through the pupil into the dark interior of the ball . The function of the pupil is to admit , and at the same time regulate the amount of , light . 4. Linings . Thus much is visible to the naked eye without dissection ...
Página 42
... observer ; c , section of candle flame ; ƒ , a distant point of sight , and n a near point of sight . ( After Helmholtz . ) the patient , A , with a lighted candle in his hand , a little to one side , as in Fig . 17 , C , while his own ...
... observer ; c , section of candle flame ; ƒ , a distant point of sight , and n a near point of sight . ( After Helmholtz . ) the patient , A , with a lighted candle in his hand , a little to one side , as in Fig . 17 , C , while his own ...
Página 82
... observer . But it will be objected that even with one eye we see no pecu- liar spot on a white wall . I therefore add : 2. That we see distinctly only a very small area about the point of sight , and distinctness decreases rapidly in ...
... observer . But it will be objected that even with one eye we see no pecu- liar spot on a white wall . I therefore add : 2. That we see distinctly only a very small area about the point of sight , and distinctness decreases rapidly in ...
Página 101
... observers differ . Some have made it a plane , some a spherical surface . Some , by purely geometrical methods , have given it the most curious forms and properties ; while others , by purely experimental methods , have come to the ...
... observers differ . Some have made it a plane , some a spherical surface . Some , by purely geometrical methods , have given it the most curious forms and properties ; while others , by purely experimental methods , have come to the ...
Página 111
... observer - for ex- ample , a card and a rod , or two rods . Then , while looking at the table on which the objects lie , hold up the forefinger - or better , a pencil - between the eyes and the objects . The pencil will of course be ...
... observer - for ex- ample , a card and a rod , or two rods . Then , while looking at the table on which the objects lie , hold up the forefinger - or better , a pencil - between the eyes and the objects . The pencil will of course be ...
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Términos y frases comunes
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 distance distant objects distinct divergence double images evident exactly Experiment external images farther fibers field of view gaze Helmholtz heteronymous homonymous horizontal horopter horopteric line identical points Illustrations impression inches inclination interocular space inverted jects law of corresponding left eye left-eye image lens light line of sight look median line middle monocular motion muscles naked eyes nearer nose oblique observer ocular optic axes optic centers optic chiasm optic convergence optic nerve outward parallel perceived perception 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 turn the eyes vergence vertical meridian vibrations visual lines visual result