The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page vii
... greater extent than is usual in text - books . A chapter on the Methods of Determination ought not to be wanting in this treatise on Refraction . But , as the Author is writing for practice rather than for science , he has only given ...
... greater extent than is usual in text - books . A chapter on the Methods of Determination ought not to be wanting in this treatise on Refraction . But , as the Author is writing for practice rather than for science , he has only given ...
Page 4
... greater . Conversely , when a ray passes from a refractive medium into one of less refractive power , it is deviated ... greater in proportion as the angle of incidence is greater . As this angle increases , there comes a time when all ...
... greater . Conversely , when a ray passes from a refractive medium into one of less refractive power , it is deviated ... greater in proportion as the angle of incidence is greater . As this angle increases , there comes a time when all ...
Page 5
... greater as the ray is more deviated from its primitive direction . To express the relation of the refractive powers of two media , we employ , therefore , the relation of the angle of incidence with the angle of refraction . M B M FIG ...
... greater as the ray is more deviated from its primitive direction . To express the relation of the refractive powers of two media , we employ , therefore , the relation of the angle of incidence with the angle of refraction . M B M FIG ...
Page 7
... greater than that of the angle of incidence . The absolute index of refraction is that which is found when light passes from a vacuum into a given medium . The relative index of refraction is that which is found when light passes from ...
... greater than that of the angle of incidence . The absolute index of refraction is that which is found when light passes from a vacuum into a given medium . The relative index of refraction is that which is found when light passes from ...
Page 8
... greater than 1 , and sin i greater than sin r . Hence the refracted ray BC ( Fig . 3 ) approaches the perpendicular PP . The converse is the case when the light passes from the second into the first medium . We then have = v n The index ...
... greater than 1 , and sin i greater than sin r . Hence the refracted ray BC ( Fig . 3 ) approaches the perpendicular PP . The converse is the case when the light passes from the second into the first medium . We then have = v n The index ...
Other editions - View all
The Refraction and Accommodation of the Eye and Their Anomalies Edmond Landolt No preview available - 2023 |
The Refraction and Accommodation of the Eye and Their Anomalies Edmond Landolt No preview available - 2018 |
Common terms and phrases
acuteness of vision adapted ametropia amplitude of accommodation angle anisometropia asthenopia astigmatism atropine axis becomes binocular vision centimetres centre choroid ciliary muscle concave glass convex glass convex lens cornea correcting-glass correction corresponding crystalline lens determine diminished dioptric apparatus dioptric system dioptries diplopia direction distant vision divergent Donders dynamic refraction effort of accommodation emmetropia emmetropic eye equal focal distance formula fundus Hence horizontal hyperopia hyperopic hyperopic eye increase index of refraction infinity inverted Landolt latter lenses less lines of fixation luminous point luminous rays maximum medium metre metre-angles millimetres mydriatic myopes myopia myopic eye nearer nodal point object observed obtain Ophth ophthalmoscope optical optometer patient placed posterior principal focus principal meridians principal point prism produced punctum proximum punctum remotum pupil range of accommodation refractive power refractive surface retina retinal images second principal situated spasm spherical static refraction strabismus tion vertical visual acuteness
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