Experimental research on the course of the optic fibres / by George Dean and C. H. Usher.

  • Dean, George.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Experimental research on the course of the optic fibres / by George Dean and C. H. Usher. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    Group IL—Ketinal Lesions away from the Macula. Monkey 6 (Macacus Khesus). An incision was made in the right eye below the macular region with a Graefe knife. Ophthalmoscopic appear mice immediately after with- drawal of the knife,—There was a bright red area, one and a quarter discs' diameter in length, and its breadth one-sixth of its length. It had well-defined margins, its long axis was vertical, and was so situated that its upper end would have touched a horizontal line drawn through the lower margin of the optic disc. It lies one optic disc's diameter external to the optic disc. Right Eye. The animal lived for twenty-nine days. Microscopical examination of the right optic 7ierve.— Throughout the entire length of the nerve there is a well- marked degeneration situated ventrally. It is roughly triangular, its base being at the periphery. In the anterior part of the chiasma a degeneration is present in the ventral part of the right side. The bulk of the degeneration retains this position and situation, but at the posterior part of the chiasma a few of the fibres have crossed. Monkey 7 (Macacus Khesus). In the left eye a similar incision was made with a cataract needle in the same way as was done with the Graefe knife in the previous case.