Sight: An Exposition of the Principles of Monocular and Binocular VisionD. Appleton, 1881 - 275 páginas |
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Página 21
... This transverse plate is not perfectly flat , but protrudes a little in the middle . In its center is a round hole , called the pupil , corresponding in position with the hole in the watch face. GENERAL STRUCTURE OF THE EYE . 21.
... This transverse plate is not perfectly flat , but protrudes a little in the middle . In its center is a round hole , called the pupil , corresponding in position with the hole in the watch face. GENERAL STRUCTURE OF THE EYE . 21.
Página 25
... perfectly sharp and dis- tinct in outline . 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 contiguous , should ...
... perfectly sharp and dis- tinct in outline . 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 contiguous , should ...
Página 35
... 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 46
... and presbyopy . Myopy , Brachymetropy , or Near - Sightedness . - The normal or emmetropic eye adjusts itself perfectly for all distances , from about five inches to infinity . It makes a perfect image of objects at all these distances.
... and presbyopy . Myopy , Brachymetropy , or Near - Sightedness . - The normal or emmetropic eye adjusts itself perfectly for all distances , from about five inches to infinity . It makes a perfect image of objects at all these distances.
Página 62
... perfectly well , but , from want of attention or culture , have not learned to nicely discriminate and name them . This must not be confounded with color- blindness . The color - blind do not see some colors as colors at all . The ...
... perfectly well , but , from want of attention or culture , have not learned to nicely discriminate and name them . This must not be confounded with color- blindness . The color - blind do not see some colors as colors at all . The ...
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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 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