Sight: An Exposition of the Principles of Monocular and Binocular VisionKegan Paul, 1881 - 307 páginas |
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Página 48
... becomes in all respects a normal eye . From the nature of the defect ( structural defect ) , it is evident that the glasses must be worn habit- ually . Presbyopy , or Old - Sightedness . - This defect is often called long - sightedness ...
... becomes in all respects a normal eye . From the nature of the defect ( structural defect ) , it is evident that the glasses must be worn habit- ually . Presbyopy , or Old - Sightedness . - This defect is often called long - sightedness ...
Página 49
... become normal with age . Now this view of the nature of presbyopy is wholly wrong . The presbyopic eye sees distant ... becomes more refrac- tive . 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 refrac- tive . In the presbyopic eye , the ciliary muscle pulls , and the curtain or capsule relaxes ...
Página 50
... become so stiff that the apparatus 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 apparatus 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 57
... become more numerous , as seen in B. In the depression of the central spot ( fovea centralis ) we find only cones , and these are of much smaller size than those in other parts of the retina , as seen in C. The rods are about inch in ...
... become more numerous , as seen in B. In the depression of the central spot ( fovea centralis ) we find only cones , and these are of much smaller size than those in other parts of the retina , as seen in C. The rods are about inch in ...
Página 69
... becomes greenish- yellow , and then green with red border , then red with indigo border , and so fades away . With the eyes open the changes are slightly different , and in some stages are complementary to the preceding . Again , if we ...
... becomes greenish- yellow , and then green with red border , then red with indigo border , and so fades away . With the eyes open the changes are slightly different , and in some stages are complementary to the preceding . Again , if we ...
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Términos y frases comunes
angle bacillary layer binocular eye binocular perspective binocular vision camera central spot Cheaper Edition ciliary muscle Cloth colors combined images cones corresponding points cross Demy 8vo depth of space distant objects distinct double images evident exactly Experiment external images farther Fcap fibers field of view focal adjustment foreground forms of perspective Frontispiece heteronymously horizontal horopter identical points Illustrations impression inches inclination interocular space jects judgments Large post 8vo left eye lens light line of sight look median plane monocular motion muscles naked eyes nearer nose object or scene observer ocular optic axes optic chiasm optic convergence optic nerve outward parallel perception of depth perfectly Poems point of sight position projection represent retina retinal images right and left right eye rotation screen Second Edition seen single side Small crown 8vo stereoscope stereoscopic pictures Third Edition tion torsion turn the eyes visual lines visual result vols
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