Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1897 - 318 páginas |
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Página 6
... already refer the cause so completely to a dis- tant object that there is but the smallest possible rem- nant of a consciousness of sensation in the ear ; the sound does not seem to be in the ear , but in yonder bell . Finally , in ...
... already refer the cause so completely to a dis- tant object that there is but the smallest possible rem- nant of a consciousness of sensation in the ear ; the sound does not seem to be in the ear , but in yonder bell . Finally , in ...
Página 15
... already described . Just before separating from the sclerotic to form the iris , it splits into two layers : one , the anterior , goes to form the iris , as already said , while the other , the pos- terior , is gathered into a cir ...
... already described . Just before separating from the sclerotic to form the iris , it splits into two layers : one , the anterior , goes to form the iris , as already said , while the other , the pos- terior , is gathered into a cir ...
Página 21
... already met , crossed , and again diverged . In both cases the image will be blurred . Observe : 1. The image is inverted . It must be so , because the central rays of all the pencils cross at a cer- tain point in the lens . This is ...
... already met , crossed , and again diverged . In both cases the image will be blurred . Observe : 1. The image is inverted . It must be so , because the central rays of all the pencils cross at a cer- tain point in the lens . This is ...
Página 25
... already been ex- plained ( page 21 ) . It is precisely the same in both cases . But lenses which form a perfect image are very difficult of construction . There are , especially , two main im- perfections which must be corrected , viz ...
... already been ex- plained ( page 21 ) . It is precisely the same in both cases . But lenses which form a perfect image are very difficult of construction . There are , especially , two main im- perfections which must be corrected , viz ...
Página 35
... already met , crossed , and again spread out . It is evident that there is but one place where the image is perfect , viz . , at the focal points , S S. Now , if this place of the image were the same for all objects at all distances ...
... already met , crossed , and again spread out . It is evident that there is but one place where the image is perfect , viz . , at the focal points , S S. Now , if this place of the image were the same for all objects at all distances ...
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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