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The Optical Manual; Or Handbook of Instructions for the Guidance of Surgeons in Testing the Range and Quality of Vision of Recruits and Others Seeking

The Optical Manual; Or Handbook of Instructions for the Guidance of Surgeons in Testing the Range and Quality of Vision of Recruits and Others Seeking


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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: FIELD OF VISION. 7 specially constructed for examining and providing the data for mapping out a field of vision are called perimeters. In the absence of these special instruments, the extent and shape of the field of vision of an eye may be obtained by causing the patient to look at a given point, and, while the eye is fixed upon it, drawing an outline of the boundary of distinct vision in all directions around it. The most convenient plan is to place the patient with one eye covered, and the other free, at a distance of about two feet in front of a black board placed perpendicularly to the line of sight. On this board, at a level with the eye under examination, a small cross in white chalk is drawn. The patient is desired to fix his eye on this mark. At the same time the surgeon, who must watch that the patient does not look away from the cross, holds a piece of chalk between his fingers of his right hand, and carries it from point to point over the board by slight quick movements of the hand, jotting down the points in various directions where it ceases to be een. These points are now joined together by lines, and thus an outline of the shape of the field of vision is formed. If the map thus made be copied on paper, it can be retained for comparison with other diagrams to be made in a similar way on future occasions. If it be important to examine the field of vision with greater precision, separate outlines can be obtained by a similar plan showing where vision sufficiently distinct to count fingers ceases, and more externally where imperfect vision or luminous impression ceases and complete absence of sight begins. Any loss of visual function in particular spots of the retina may also be traced and noted during the examination by moving the chalk slowly and carefully ove...


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Product Details
  • ISBN-13: 9780217098861
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 96
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 021709886X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 186 gr


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