The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 103
... effort of its accommodation . Let us now seek to determine the radius of curvature necessary to produce a curval hyperopia of 4 dioptries = 0-25 m . 1 In this case f is negative , and the formula for the radius of curvature becomes- In ...
... effort of its accommodation . Let us now seek to determine the radius of curvature necessary to produce a curval hyperopia of 4 dioptries = 0-25 m . 1 In this case f is negative , and the formula for the radius of curvature becomes- In ...
Page 162
... effort of accommodation by bringing the object nearer to the eye . Our schematic figure ( 75 ) represents the phenomena which Coccius was able to observe when the eye passed from the state of rest ( R ) to that of accommodation ( A ) ...
... effort of accommodation by bringing the object nearer to the eye . Our schematic figure ( 75 ) represents the phenomena which Coccius was able to observe when the eye passed from the state of rest ( R ) to that of accommodation ( A ) ...
Page 166
... effort , in consequence of which the refractive power of the eye is increased . In a state of rest , the dioptric system of the eye presents its minimum of refractive power ; the eye is adapted to the most distant point that it can see ...
... effort , in consequence of which the refractive power of the eye is increased . In a state of rest , the dioptric system of the eye presents its minimum of refractive power ; the eye is adapted to the most distant point that it can see ...
Page 170
... effort of accommoda- tion , it has become equal to 20 D ? Evidently its refraction was four dioptries less r20 4 16 D. 4 16 D. That is to say , the eye was : myopic by 16 D. - We have solved the problem by means of our formula r = 1 1 ...
... effort of accommoda- tion , it has become equal to 20 D ? Evidently its refraction was four dioptries less r20 4 16 D. 4 16 D. That is to say , the eye was : myopic by 16 D. - We have solved the problem by means of our formula r = 1 1 ...
Page 171
... necessarily be greater than that of the emmetrope . In order merely to render himself emmetropic , the hyperope has been forced to exert an effort of accommodation to 1 R fill the place of such a convex lens AMPLITUDE OF ACCOMMODATION .
... necessarily be greater than that of the emmetrope . In order merely to render himself emmetropic , the hyperope has been forced to exert an effort of accommodation to 1 R fill the place of such a convex lens AMPLITUDE OF ACCOMMODATION .
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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