The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 15
... especially , find , almost everywhere , spherical surfaces called upon to produce images . It is , however , possible to obtain an image almost reduced to a point , if in producing it one does not use a very extended surface , but only ...
... especially , find , almost everywhere , spherical surfaces called upon to produce images . It is , however , possible to obtain an image almost reduced to a point , if in producing it one does not use a very extended surface , but only ...
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 33
... especially in an apparatus like the eye , where we have to do with a considerable number of refracting surfaces . As illustrating this , it suffices to recall the surfaces of the different layers of the crystalline . Very fortunately ...
... especially in an apparatus like the eye , where we have to do with a considerable number of refracting surfaces . As illustrating this , it suffices to recall the surfaces of the different layers of the crystalline . Very fortunately ...
Page 70
... especially when we are dealing with problems in physiological optics . But the old system has still another disadvantage . In practice we have much more to do with refractive powers than with focal distances . These two properties are ...
... especially when we are dealing with problems in physiological optics . But the old system has still another disadvantage . In practice we have much more to do with refractive powers than with focal distances . These two properties are ...
Page 118
... especially important to consider in determining the excursions of the eye , the angle of strabismus , & c . If the optic axis and that of the corneal ellipse coincide or may be regarded as coincident , as is done in practice , the ...
... especially important to consider in determining the excursions of the eye , the angle of strabismus , & c . If the optic axis and that of the corneal ellipse coincide or may be regarded as coincident , as is done in practice , the ...
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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