Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
Dentro del libro
Resultados 1-5 de 43
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 ...
Otras ediciones - Ver todas
Términos y frases comunes
angle axis bacillary layer binocular eye binocular perspective binocular vision camera central spot ciliary muscle circle colors combined images cornea corresponding points cross depth of space distance distant objects distinct divergence double images evident exactly Experiment external images farther fibers field of view gaze Helmholtz heteronymous homonymous horizontal horopter horopteric line identical points Illustrations impression inches inclination interocular space inverted jects law of corresponding left eye left-eye image lens light line of sight look median line middle monocular motion muscles naked eyes nearer nose oblique observer ocular optic axes optic centers optic chiasm optic convergence optic nerve outward parallel perceived perception perfect image perfectly point of sight position projection pupil ray-lines rays refractive represent retina retinal images right and left right eye right-eye image rotation sclerotic screen seen single shut side stereoscope surface tion torsion turn the eyes vergence vertical meridian vibrations visual lines visual result