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Text-Book of Ophthalmoscopy Volume 1

Text-Book of Ophthalmoscopy Volume 1


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...would. For example, a myope of fa finds that he needs a convex fa to see the fundus distinctly. If he adds this glass he is no longer myopic fa, but fa ] fa = fa. Now we have just found that the // equaled the M minus the distance, and as the M = fa we get // = fa--2 = fa. The observer in this case may use his A instead of a lens, providing he can estimate the amount. If, however, the hypermetropia in the observed eye is less than the myopia of the observer (the distance between the eyes being taken into account), it is evident that the rays emerging from the eye will be so little divergent that the stronger myopia of the observer will cause them to meet in front of his retina. The observer must make himself less myopic in order to bring such rays to a focus on his retina; this he does by means of a concave glass. For example, a myope of fa can only see the fundus in a given case with--fa, what is the II of the observed eye? By placing the concave glass before his eye, he has reduced his myopia so that he has no longer M = fa, but fa--fa--fa. As we have previously found that H = M minus the distance, we have II = fa-2 = fa The observer being hypermetropic. Proposition IV. For a hypermetropic observer to see an emmetropic eye.--Inasmuch as the rays leaving an emmetropic eye are parallel, the observer, in order to bring such rays to a focus on his retina, will simply have to neutralize his manifest hypermetropia. If he is Ufa, then he will simply have to place a convex fa behind the mirror. He may find, however, that with the ophthalmoscope he does not relax his accommodation. His hypermetropia, consequently, will be reduced by just the amount of accommodation which he is using. And he may find that instead of using say a convex of fa, which fully neutralizes...


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Product Details
  • ISBN-13: 9781152051874
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1152051873
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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