Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1897 - 318 páginas |
Dentro del libro
Resultados 1-5 de 29
Página xi
... theory of adjustment , 38 ; Helmholtz's view , 39 . SECTION II . - DEFECTS OF THE EYE AS AN INSTRUMENT , 40 ; THE IMPERFECT EYE , 40 ; emmetropy , or normal sight , 41 ; de- PAGE 1 9 24 fects- ( 1 ) myopy , or near sight , xi.
... theory of adjustment , 38 ; Helmholtz's view , 39 . SECTION II . - DEFECTS OF THE EYE AS AN INSTRUMENT , 40 ; THE IMPERFECT EYE , 40 ; emmetropy , or normal sight , 41 ; de- PAGE 1 9 24 fects- ( 1 ) myopy , or near sight , xi.
Página 22
... defects we will speak more fully hereafter . The fundamental fact of the existence of the retinal image may be proved in many ways by observations on the dead eye : 1. If the eye of an ox be taken from the socket and the sclerotic ...
... defects we will speak more fully hereafter . The fundamental fact of the existence of the retinal image may be proved in many ways by observations on the dead eye : 1. If the eye of an ox be taken from the socket and the sclerotic ...
Página 27
... defect must be corrected . It is corrected in every good lens . FIG 11 . In order to understand how this is done , it must be remembered , first , that concave and convex lenses an- tagonize , and , if of equal refractive power ...
... defect must be corrected . It is corrected in every good lens . FIG 11 . In order to understand how this is done , it must be remembered , first , that concave and convex lenses an- tagonize , and , if of equal refractive power ...
Página 29
... defect , much more diffi- cult to correct , is aberration . The form of lens most easily made has a spherical curvature . But in such a lens there is an excess of refractive power in the mar- ginal portions as compared with the central ...
... defect , much more diffi- cult to correct , is aberration . The form of lens most easily made has a spherical curvature . But in such a lens there is an excess of refractive power in the mar- ginal portions as compared with the central ...
Página 30
... defect must be corrected . It is cor- is blurred . rected in the best lenses . The aberration may be greatly decreased by the use of diaphragms , which cut off all but the central rays ; but in this case we get distinctness at the ...
... defect must be corrected . It is cor- is blurred . rected in the best lenses . The aberration may be greatly decreased by the use of diaphragms , which cut off all but the central rays ; but in this case we get distinctness at the ...
Otras ediciones - Ver todas
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