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The Optical Defects of the Eye, and Their Consequences, Asthenopia and Strabismus

The Optical Defects of the Eye, and Their Consequences, Asthenopia and Strabismus


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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. 1865 Excerpt: ...as the ophthalmoscope showed. The optic entrances were only recognisable by the confluence of the retinal vessels, which were, at parts, much obscured. In the left fundus some pale, irregular spots, with slightly pigmented deposits, were observed. The direct image in each eye was well seen at 7--8" off without any ocular; at 1"--2" a 12-inch convex ocular was necessary. From the above it follows that part of the amblyopia was owing to some chronic retinal and choroidal processes. Case VI. Henry N., set. 10.--His sight had been defective as early as he could remember, having been unable to see either near or distant objects well. He had been repeatedly very severely punished by his father, who thought he was malingering at school; but an inspector of schools, who believed in the reality of his defective vision, advised him to go to the hospital to have his eyes examined. I found a manifest hypermetropia of iV, and a total of J, with an acuteness of vision of J. Ophthalmoscopically I detected nothing morbid, but slightly egg-shaped optic entrances. He said he saw horizontal lines better than vertical ones. But I found him so unintelligent as to render any exact determination of his astigmatism practically impossible. Now, as you perfectly understand, the eye has within itself an intrinsic power of increasing its converging action (in the crystalline). The normal eye has no occasion to exercise this function for distant objects, and therefore it remains in a state of rest. The myopic eye is already abnormally excessive in its converging power, and would therefore, if it could, rather diminish, than increase the convexity of its crystalline. But, as you might a priori have expected, the hypermetropic eye accommodates even for distance, abnormally...


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Product Details
  • ISBN-13: 9781130414028
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130414027
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr

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