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A Manual of Ophthalmoscopy, Tr. by C.S. Jeaffreson

A Manual of Ophthalmoscopy, Tr. by C.S. Jeaffreson


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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: CHAPTER II. OPHTHALMOSCOPY. The ophthalmoscope, invented by Helmholtz in 1851, is an instrument designed for the illumination of the fundus of the eye, and to enable us to see an image of it. It is composed essentially of two parts?(1) a concave mirror, pierced by a small central orifice; (2) a strong biconvex lens, of 2J or 3 in. focus. The eye may be lighted up with either of these parts used separately, or in combination. Lateral, or oblique, illumination, is practised when the lens is used alone. An ophthal- moscopic examination, properly so called, is made when the mirror is used, either alone, or in combination with the lens. ARTICLE I. OBLIQUE ILLUMINATION. This method of illumination does not form any part of ophthalmoscopy, properly so called.It is exclusively used in an examination of the anterior hemisphere of the eye. By this means we can carefully overlook (1) the cornea, (2) the anterior chamber, (3) the iris and pupillary orifice, (4) the crystalline lens, (5) the most anterior portions of the vitreous body. To put it into practice, the room must be darkened, and a lamp must be placed on one side of the patient, on a level with his eye, and about three feet off. By means of the biconvex lens, we concentrate upon the anterior hemisphere of the eye, the summit of the luminous cone furnished by the rays emanating from the lamp. Then, by means of slight displacements of the lens, we cause it to pass Over the whole surface of the cornea, which becomes brilliantly illuminated. The observer can now perceive the most minute alterations in the transparent media. To render these changes more evident, and to enlarge the image, he can make use of a second convex lens, after the method of an ordinary magnifying glass. ARTICLE II. OPHTHALMOSCOPIC ILLUMINATIO...


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Product Details
  • ISBN-13: 9780217671934
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217671934
  • Publisher Date: 12 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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