Sight: An Exposition of the Principles of Monocular and Binocular VisionKegan Paul, 1881 - 307 páginas |
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Página 41
... adjustment of the instrument for the distance of the object . There are only two possible ways in which this ad- justment can be made : Either ( 1st ) , the lens remaining unchanged , the screen must advance or recede with the image ...
... adjustment of the instrument for the distance of the object . There are only two possible ways in which this ad- justment can be made : Either ( 1st ) , the lens remaining unchanged , the screen must advance or recede with the image ...
Página 43
... adjusting the eye to very near objects , the crystalline becomes thicker in the middle , and pushes the pupil a little forward . In the accompanying diagram ... Adjustment . Thus much may be con- sidered. THE EYE AS AN OPTICAL INSTRUMENT .
... adjusting the eye to very near objects , the crystalline becomes thicker in the middle , and pushes the pupil a little forward . In the accompanying diagram ... Adjustment . Thus much may be con- sidered. THE EYE AS AN OPTICAL INSTRUMENT .
Página 44
... Adjustment . Thus much may be con- sidered certain . It is certain that in adjusting the eye for looking at very near objects , the lens becomes more convex . But the question , " How is this done ? " is more difficult to answer ...
... Adjustment . Thus much may be con- sidered certain . It is certain that in adjusting the eye for looking at very near objects , the lens becomes more convex . But the question , " How is this done ? " is more difficult to answer ...
Página 45
... adjustment or of distinct vision is , therefore , within these limits . It is only at compar- atively near distances , however , that the change is great . Between twenty feet and infinite distance the adjust- ment is almost ...
... adjustment or of distinct vision is , therefore , within these limits . It is only at compar- atively near distances , however , that the change is great . Between twenty feet and infinite distance the adjust- ment is almost ...
Página 48
... adjustment or change in the lens to effect these ranges is as great as for the normal range from infinite distance to five inches , but the latter is a far more use- ful range . The myopic eye , therefore , is like a camera which was ...
... adjustment or change in the lens to effect these ranges is as great as for the normal range from infinite distance to five inches , but the latter is a far more use- ful range . The myopic eye , therefore , is like a camera which was ...
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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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