The Fundus Oculi of Birds, Especially as Viewed by the Ophthalmoscope; A Study in Comparative Anatomy and Physiology

The Fundus Oculi of Birds, Especially as Viewed by the Ophthalmoscope; A Study in Comparative Anatomy and Physiology

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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. 1917 edition. Excerpt: ...and orange below. The lower sectors of the fundus are stippled with pigment. Choroidal vessels are numer ous and run in rather straight, vertical lines on both sides of the optic disc. They are dull-orange in color. The fovea is shown towards the anterior or nasal half of the retina, and appears as a round hole or crater-like depression, brown in color, which reflects a grayish sheen from its center. A narrow gray circle or reflex ring surrounds this pit. The optic disc has its central portion apparently stippled with bright orange-red dots, while its margin is fringed with coarse, white fibres, that are also studded with brown pigment dots especially near the outer border. The pecten is of the usual deep, chocolatebrown color, rather narrow where it joins the disc but becoming much thicker and more massive as it projects into the vitreous towards the lens. BRAZILIAN SERIEMA. Cariama cristata. This species presents an ophthalmoscopic picture of the right eye, erect image, that is reproduced as Plate XIX, page 139. The dominant color of the fundus oculi is a dulldrab. Over the lower quadrants of the eyeground run rather straight, dull-red, choroidal capillaries that fade away as they reach the upper half of the field. This region is also shot with a greenish-blue muslin-like film, which is probably a reflection by the retina of light rays from the ophthalmoscopic mirror. Above the end of the disc is a small, round depression, quite clear of any reflex. To the inner or beak side of the eye is the circular macula, whose diameter is about three times that of the cavity at the end of the disc. The center of the larger circle is quite clear, with the exception of a bright shimmer, such as is sometimes seen about the human fovea. The...show more

Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236878213
  • 9781236878212