The Refraction and Accommodation of the Eye and Their AnomaliesPentland, 1886 - 600 pages |
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Page 4
... refractive power ( density ) between the two media is greater . Conversely , when a ray passes from a refractive medium into one of less refractive power , it is deviated in the opposite direction ; i.e. , it deviates from the ...
... refractive power ( density ) between the two media is greater . Conversely , when a ray passes from a refractive medium into one of less refractive power , it is deviated in the opposite direction ; i.e. , it deviates from the ...
Page 8
... refractive power of a substance , the deviation to which a ray of light coming from the air ( or rather from a vacuum ) is subject when it enters this substance , i.e. , the relation between the sine of the angle of incidence and the ...
... refractive power of a substance , the deviation to which a ray of light coming from the air ( or rather from a vacuum ) is subject when it enters this substance , i.e. , the relation between the sine of the angle of incidence and the ...
Page 64
... refractive power and the focal distance of a lens are inversely proportional to each other . Let us call the refractive power d and the focal distance F ; we may then say— 30 or d F = = 1 F 1 a If a positive or negative lens be applied ...
... refractive power and the focal distance of a lens are inversely proportional to each other . Let us call the refractive power d and the focal distance F ; we may then say— 30 or d F = = 1 F 1 a If a positive or negative lens be applied ...
Page 66
... refractive power F and the combination of the two gives , consequently , the sum- 1 F ' - e ' 1 + 1 1 = F ' . -e F " X ' 21 . Let us again suppose F ' equal to 333 millimetres , and F " to 250 millimetres ; but , instead of bringing the ...
... refractive power F and the combination of the two gives , consequently , the sum- 1 F ' - e ' 1 + 1 1 = F ' . -e F " X ' 21 . Let us again suppose F ' equal to 333 millimetres , and F " to 250 millimetres ; but , instead of bringing the ...
Page 70
... refractive power ( d ) of , since 1 d In the same way , the focal distance is the inverse of the refractive power : from 1/2 1 80 ' F = 글 The lenses usually employed in ophthalmological practice vary from 2 " to 80 " in focal distance ...
... refractive power ( d ) of , since 1 d In the same way , the focal distance is the inverse of the refractive power : from 1/2 1 80 ' F = 글 The lenses usually employed in ophthalmological practice vary from 2 " to 80 " in focal distance ...
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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