The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 20
... front of the surface . Then f " , of the formula 2 b , becomes infinite , and we obtain- n ' n " - n ' ጥ In this particular case the point of union , of rays which were parallel in the second medium , is called the first principal ...
... front of the surface . Then f " , of the formula 2 b , becomes infinite , and we obtain- n ' n " - n ' ጥ In this particular case the point of union , of rays which were parallel in the second medium , is called the first principal ...
Page 22
... front of , or f " behind the refracting surface , or at g ' in front of , or g " to the rear of its centre of curvature . We deduce , in fact , from the formulæ 7 , for these different lengths , the following formulæ : f " = F " f f - F ...
... front of , or f " behind the refracting surface , or at g ' in front of , or g " to the rear of its centre of curvature . We deduce , in fact , from the formulæ 7 , for these different lengths , the following formulæ : f " = F " f f - F ...
Page 24
... front of the surface , L " should be beyond 4 " , behind the surface ; hence f ' and ƒ " are positive ( Fig . 8 ) . Let us take an example . L ' being 250 millimetres in front of the surface , and F " and F ' , equal respectively to 20 ...
... front of the surface , L " should be beyond 4 " , behind the surface ; hence f ' and ƒ " are positive ( Fig . 8 ) . Let us take an example . L ' being 250 millimetres in front of the surface , and F " and F ' , equal respectively to 20 ...
Page 25
... front of it ( compare Fig . 15 ) . When L ' is on the surface itself , the image and object of the point coincide . IMAGE FORMED BY A SINGLE REFRACTING SURFACE . We have seen that a luminous point L ' , situated at a distance f ' in front ...
... front of it ( compare Fig . 15 ) . When L ' is on the surface itself , the image and object of the point coincide . IMAGE FORMED BY A SINGLE REFRACTING SURFACE . We have seen that a luminous point L ' , situated at a distance f ' in front ...
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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