Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1897 - 318 páginas |
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Página 14
... perfectly flat , but protrudes a little in the middle . In its center is a round hole , called the pupil , corre- sponding in position with the hole in the watch face for attachment of the hands . The pupil seems to be jet black ...
... perfectly flat , but protrudes a little in the middle . In its center is a round hole , called the pupil , corre- sponding in position with the hole in the watch face for attachment of the hands . The pupil seems to be jet black ...
Página 18
... perfectly sharp and dis- tinct in outline and surface details . Brightness only requires a sufficient amount of light . In order to be perfectly distinct , it is necessary that rays from different points in the object , even the most ...
... perfectly sharp and dis- tinct in outline and surface details . Brightness only requires a sufficient amount of light . In order to be perfectly distinct , it is necessary that rays from different points in the object , even the most ...
Página 29
... perfectly corrected . It can be observed if we use only the extreme colors , red and violet . * But the degree of chromatism is so small as not to interfere at all with the accuracy of vision . 4. Aberration . - Another defect , much ...
... perfectly corrected . It can be observed if we use only the extreme colors , red and violet . * But the degree of chromatism is so small as not to interfere at all with the accuracy of vision . 4. Aberration . - Another defect , much ...
Página 41
... perfectly for all distances , from about five inches to infinity . It makes a perfect image of objects at all these distances . This is called its range of distinct vision . It has but one limit , viz . , the nearer limit of five inches ...
... perfectly for all distances , from about five inches to infinity . It makes a perfect image of objects at all these distances . This is called its range of distinct vision . It has but one limit , viz . , the nearer limit of five inches ...
Página 49
... perfectly distinctly at f , because there is there no ver- tical blurring , but only horizontal . This would not affect visibly the horizontal , but would render the ver- tical line very indistinct . At the distance ƒ ' , on the con ...
... perfectly distinctly at f , because there is there no ver- tical blurring , but only horizontal . This would not affect visibly the horizontal , but would render the ver- tical line very indistinct . At the distance ƒ ' , on the con ...
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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