Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1897 - 318 páginas |
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Página 14
... 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 37
... observer ; c , section of candle - flame ; f , a distant point of sight , and n a near point of sight . ( After Helmholtz . ) FIG . 19 . of observation is on the other side , B. If the observer now looks carefully , he will see in the ...
... observer ; c , section of candle - flame ; f , a distant point of sight , and n a near point of sight . ( After Helmholtz . ) FIG . 19 . of observation is on the other side , B. If the observer now looks carefully , he will see in the ...
Página 38
... observer the patient transfers the point of sight to a very near point , n , with- out changing the direction , we observe that the images a and c do not change , but the image b changes its posi- tion and grows smaller . This image is ...
... observer the patient transfers the point of sight to a very near point , n , with- out changing the direction , we observe that the images a and c do not change , but the image b changes its posi- tion and grows smaller . This image is ...
Página 86
... observer . But it will be objected that even with one eye we see no pecul- iar 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 pecul- iar 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 118
... observers differ . Some have made it a plane , some a spherical surface . Some , by purely geometrical methods , have given it the most * The angles An B and An ' B are equal because they are angles at the circumference standing on the ...
... observers differ . Some have made it a plane , some a spherical surface . Some , by purely geometrical methods , have given it the most * The angles An B and An ' B are equal because they are angles at the circumference standing on the ...
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Términos y frases comunes
adjustment angle axis bacillary layer becomes binocular eye binocular perspective binocular vision blind spot camera central spot ciliary muscle circle colors combined image concave corresponding points cross defect depth of space distance distant objects distinct divergence double images evident exactly Experiment explained external images farther fibers field of view focal fore fovea Helmholtz heteronymous homonymous horizontal horopter horopteric line Illustrations impression inches inclined interocular space left eye left-eye image lens light line of sight look median plane middle monocular motion muscles nearer normal eye nose oblique observer ocular optic axes optic chiasm optic nerve optic vesicle outward parallel perceived perception perfectly phantom phenomena point of sight position primary projection pupil ray-line rays refractive represent retina retinal images right and left right eye right-eye image rotation sclerotic screen seen single sensation side stereoscope surface tion torsion turn the eyes vergence vibrations visual lines visual result