Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
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Resultados 1-5 de 46
Página 35
... nearer . In Fig . 12 the marginal rays , a r ' , a r ' , are brought to a focus at a " , while the central rays , a r , a r , are brought to a focus at a ' . The best place for the receiving screen would be at S S , between these ; but ...
... nearer . In Fig . 12 the marginal rays , a r ' , a r ' , are brought to a focus at a " , while the central rays , a r , a r , are brought to a focus at a ' . The best place for the receiving screen would be at S S , between these ; but ...
Página 41
... nearer , we draw out the tube so as to carry the ground - glass plate a little farther back ; when the object recedes , we slide up the tube so as to bring the receiving plate nearer the lens . So in the opera - glass we elongate the ...
... nearer , we draw out the tube so as to carry the ground - glass plate a little farther back ; when the object recedes , we slide up the tube so as to bring the receiving plate nearer the lens . So in the opera - glass we elongate the ...
Página 47
... nearer objects , a voluntary effort is necessary to throw the image on the retina , which effort is greater as the object is nearer , until it is limited at the distance of about five inches . The normal eye , therefore , is like a ...
... nearer objects , a voluntary effort is necessary to throw the image on the retina , which effort is greater as the object is nearer , until it is limited at the distance of about five inches . The normal eye , therefore , is like a ...
Página 48
... nearer distances , and 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 ...
... nearer distances , and 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 ...
Página 50
... nearer and a farther limit ; in the nor- mal eye it is between five inches , near limit , and infinite distance , the farther limit ( if limit it can be called ) ; in the myopic eye the nearer limit may be two inches , the farther limit ...
... nearer and a farther limit ; in the nor- mal eye it is between five inches , near limit , and infinite distance , the farther limit ( if limit it can be called ) ; in the myopic eye the nearer limit may be two inches , the farther limit ...
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Términos y frases comunes
angle axis bacillary layer binocular eye binocular perspective binocular vision camera central spot ciliary muscle circle colors combined images cones corresponding points cross depth of space distant objects distinct double images evident exactly Experiment external images eyes by squinting farther fibers field of view figures finger focal adjustment foreground forms of perspective gaze heteronymously homonymously horizontal horopter identical points impression inches inclination interocular space inverted jects left eye lens less convergence light line of sight look median plane monocular images motion muscles naked eyes nearer nose object or scene oblique observer ocular optic axes optic chiasm optic convergence optic nerve outward parallel perceived perception of depth perfect image perfectly point of sight position projection rays refractive represent retina retinal images right and left right eye rotation sclerotic screen seen single side stereoscope stereoscopic pictures surface tion torsion turn the eyes unite visual lines visual result