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Scientific Proceedings Volume 11

Scientific Proceedings Volume 11


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...the tufts occupy a slightly smaller area than the claretcoloured area due to the macula Iutea or yellow spot, as I have noticed a fringe of the claret colour on the outside of the threequarter-moonshaped area. of the tufts. This agrees with my measurement of the macula and tbe tufts; the former appears to be approximately 1 mm. and the latter 0'8 mm. in their longest diameter. In repeating the double pinhole experiment described by Prof. Barrett, I could only see a single image of the tufts, no matter what part of the duplicated image of the pupil the gaze was directed to, thus verifying the Professor's observation. I tried whether the tufts could be seen by focusing a polarized pencil of rays from the electric are on the sclerotic, but could not see them; the non-appearance of the tufts may, of course, be due to their extreme faintness under these conditions, or to the fact that the rays did not fall on the yellow spot. The existence of H idinger's tufts show that the light of direct vision is always polarized. This fact seems to me one of considerable interest in the theory of vision. 2. Pur/cinje's figures.-Plate VIII., fig. 1, is a careful drawing of Purkinje's figures as I see them when a brilliant point of light falls on the sclerotic. In the central part there appears to be an area where no shadows of the vessels are seen, and around this area the iiner branching capillaries appear to me to end abruptly. This area is at the retinal extremity of the line of sight, and surrounds the point of fixation. Some of the retinal vessels I observe cross each other. In certain positions of the eye I have occasionally noticed that the shadows of the vessels where they spread from the optic..."


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Product Details
  • ISBN-13: 9781234137564
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 86
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1234137569
  • Publisher Date: 05 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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