Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1897 - 318 páginas |
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Resultados 6-10 de 49
Página 38
... becomes smaller , shows that this anterior surface be- comes more convex . By careful examination the iris , too , may be seen to protrude a little in the middle . Evidently , therefore , in adjusting the eye to very near objects , the ...
... becomes smaller , shows that this anterior surface be- comes more convex . By careful examination the iris , too , may be seen to protrude a little in the middle . Evidently , therefore , in adjusting the eye to very near objects , the ...
Página 42
... becomes in all respects a normal eye . From the nature of the defect ( struc- tural defect ) , it is evident that the glasses must be worn habitually . 2. Hypermetropy - Hyperopy - oversightedness . - Hy- peropy is the opposite of myopy ...
... becomes in all respects a normal eye . From the nature of the defect ( struc- tural defect ) , it is evident that the glasses must be worn habitually . 2. Hypermetropy - Hyperopy - oversightedness . - Hy- peropy is the opposite of myopy ...
Página 44
... become normal with age . Now this view of the nature of presbyopy is wholly wrong . The presbyopic eye sees distant ... becomes more refract- ive . In the presbyopic eye , the ciliary muscle pulls , and the curtain or capsule relaxes ...
... become normal with age . Now this view of the nature of presbyopy is wholly wrong . The presbyopic eye sees distant ... becomes more refract- ive . In the presbyopic eye , the ciliary muscle pulls , and the curtain or capsule relaxes ...
Página 45
... become so stiff that the арра- ratus for adjustment no longer works . It still operates well for distant objects , but can not be adjusted for nearer objects . If we desire to image a near object in such a camera , obviously we must ...
... become so stiff that the арра- ratus for adjustment no longer works . It still operates well for distant objects , but can not be adjusted for nearer objects . If we desire to image a near object in such a camera , obviously we must ...
Página 46
... becomes too flat to be accommodated even for distant objects , and therefore two glasses must be used . 4. Astigmatism - Dim - sightedness .-- In all the other defects there is clear sight at some distance , although it may not be a ...
... becomes too flat to be accommodated even for distant objects , and therefore two glasses must be used . 4. Astigmatism - Dim - sightedness .-- In all the other defects there is clear sight at some distance , although it may not be a ...
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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