The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
From inside the book
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Page ix
... Principal Points and Planes of the Eye - Principal Focal Distances of the Eye - Nodal Points of the Eye- Conjugate Foci of the Eye - Size of the Image - Negative Conjugate Focus -Convergent Incident Rays - The Reduced Eye - The ...
... Principal Points and Planes of the Eye - Principal Focal Distances of the Eye - Nodal Points of the Eye- Conjugate Foci of the Eye - Size of the Image - Negative Conjugate Focus -Convergent Incident Rays - The Reduced Eye - The ...
Page 15
... PRINCIPAL AND CONJUGATE FOCI . Let L ' ( Fig . 8 ) be the luminous point and SHS a spherical surface , but in this case reduced to a smaller portion than we have drawn in the figure . 1 Wundt's Physique médicale , translated by Monoyer ...
... PRINCIPAL AND CONJUGATE FOCI . Let L ' ( Fig . 8 ) be the luminous point and SHS a spherical surface , but in this case reduced to a smaller portion than we have drawn in the figure . 1 Wundt's Physique médicale , translated by Monoyer ...
Page 19
Edmond Landolt. This is an especially important case . We give the name second principal focus to the principal posterior focus , because it is situated behind the refracting surface , at the spot where the rays , which were H FIG . 9 ...
Edmond Landolt. This is an especially important case . We give the name second principal focus to the principal posterior focus , because it is situated behind the refracting surface , at the spot where the rays , which were H FIG . 9 ...
Page 20
... principal focus or principal anterior focus . We shall designate it by p ' . The distance ' H ( Fig . 10 ) , which separates it from the refractive surface , will then be the first principal focal distance . FIG . 10 . We designate it ...
... principal focus or principal anterior focus . We shall designate it by p ' . The distance ' H ( Fig . 10 ) , which separates it from the refractive surface , will then be the first principal focal distance . FIG . 10 . We designate it ...
Page 23
... principal focus . This is conceivable : parallel rays are united at the focus , in p " , and rays which are already con- vergent before reaching the surface must be united nearer the surface than the parallel ones , and all the nearer ...
... principal focus . This is conceivable : parallel rays are united at the focus , in p " , and rays which are already con- vergent before reaching the surface must be united nearer the surface than the parallel ones , and all the nearer ...
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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