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Text-Book of Ophthalmoscopy. Part I.

Text-Book of Ophthalmoscopy. Part I.


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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: ...most ametropic meridian. This shows compound astigmatism--general M or H, with increased M or // in one meridian. Beyond the distance at which the image is exactly circular the conditions are reversed and become the same as in the upright image--that is, the long diameter of the oval is in the meridian of the greatest curvature. The principle contained in the above may perhaps be more tersely expressed as follows: If the long diameter of the oval contracts when the lens is moved from the eye so as to become equal to the short, and thus make a circle, then the astigmatism is due to II. If, on the contrary, the short diameter expands so as to become equal, at the focal distance of the lens, to the long, and thus make a circle, then it is due to myopia. If all the diameters contract--but one contracts more than the rest--then general II is present with II increased in one meridian. If all increase--but one more than the rest--then M is present with M increased in one principal meridian. The astigmatism is compound. If one diameter expands and one contracts, then both M and 7/are present, and the astigmatism is mixed. We see from this that astigmatism may be detected in two stages in the passage of the lens: first, when it is moved from a point close to the eye to a distance equal to its focal length; secondly, from this point outward to a distance limited to the contracting field of view by which the image of the disk is rapidly shut out by that of the iris. It is in this last stage from the focal distance outward that the effect is most pronounced, as a rule. It is, however, better to make the lens move through the entire course. Great care must be taken not to rotate the lens at all, but to maintain it as exactly as possible in a plane perpendicular to its l...


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Product Details
  • ISBN-13: 9781130020342
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 110
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130020347
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr

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