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Physiologic Optics; Dioptrics of the Eye, Functions of the Retina Ocular Movements and Binocular Vision

Physiologic Optics; Dioptrics of the Eye, Functions of the Retina Ocular Movements and Binocular Vision


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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. 1920 Excerpt: ...only lialf the central accommodation or still less. If, after having dilated my pupil to the utmost (with a mixture of cocaine and homatropine), I use an interval of 7 millimeters, my accommodation which, at the middle of the pupil, is 2.5 D. to 3 D., diminishes nearly to zero (0.2 D.) on the borders. Here are some measurements: Central amplitude Peripheral amplitude (interval 0.75 mm.). (interval 5 mm.). Young 9.8 D. 4.2 D. Koster 8 D. 3.3 D. Demicheri 7.5 D. 3.7 D.--6 D.(l) 3 D.--4 D.(l) 2 D. Mme T 6.7 D. 3.8 D. Tscherning 3 D. 1.25 D. We find still more considerable differences between the central and peripheral accommodation, by placing the two slits sometimes at the middle of the pupil, sometimes near the borders: AMPLITUDE OF ACCOMMODATION Temporal border. Center. Nasal border. Demicheri (Homatropine) 6 D. 2D----0 4 D.(1)I i). Mme T 5 D. 6.7 D. 5 D. Tscherning (Homatropine) 0.25 D. H D. 0 d. Sk1ascop1c Exam1nat1on.--Observations a and b are easy to make, but they require that the observer be young, that his pupil be well dilated and that he be master of his accommodation; observations with the optometer of Young, as well as those with the ophthalmometer, which I shall describe forthwith, are quite delicate and require special instruments. But we possess in skiascopy with a luminous point a very convenient means of studying the nature of accommodation. To make the observation we select a child or a young person whose pupil is well dilated with cocaine. It is better to select a person whose pupil is well dilated, who is almost emmetropic, and who has not too much aberration in a state of repose. We place the lamp, surrounded with its perforated screen, at one side of and a little behind the observed person and we project light on his eye by means of a c...


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Product Details
  • ISBN-13: 9781235898136
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 122
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 123589813X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 231 gr


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