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An Introduction to Geology, and Its Associated Sciences, Mineralogy, Fossil Botany and Conchology and Palaeontology

An Introduction to Geology, and Its Associated Sciences, Mineralogy, Fossil Botany and Conchology and Palaeontology


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: What is the field of vision? The area over which objects may be distinguished, while the eye is kept fixed on some one point. 70 60 50 410 JO a Normal visual field (left eye). What is the necessity of determining the extent of the visual field? To determine the extent of the influence of a disease process on the vision, and as an aid to the location of the lesion in certain forms of disease which affect the vision. Its contraction for white or colored objects givesreliable information of the progress of disease in cases of atrophy of the optic nerve and retina, and valuable suggestions regarding the time and propriety for operation in glaucoma. How is the extent of the field of vision determined? By seating the patient before a blackboard with a white dot in the center so that the eye to be tested is about twelve inches from the surface of the board and in a line with the center, then, having closed or covered the other eye, the eye to be examined is directed upon the dot in the center of the board. Then the surgeon slowly projects a small white object along the surface of the blackboard from the temporal side of the patient until he perceives it, when a mark is made upon the board at that point. In this way the object is carried in a circle around the center of fixation, marking the most extreme points which the patient is able to see, while his vision is concentrated upon the dot. Lines connecting the various points thus made upon the blackboard form the boundary which encloses the field of vision. The field of vision may be roughly taken by having the patient close one eye and with the other look at a button upon the coat of the surgeon, who stands in front of him; the fingers or an object held in them then describe the circle which is mentally registere...


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Product Details
  • ISBN-13: 9780217849425
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 158
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 0217849423
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 295 gr


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