Illustrations of the use of the ophthalmoscope / by William Martin.

  • Martin, William.
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: Illustrations of the use of the ophthalmoscope / by William Martin. 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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    ever, both conditions exist in combination (Des- m aires). Abnormal Insertion of the Optic Papilla, without any special disease, is described ; but further observation is required on this point. Ancemia of the Papilla is observed in all cases of atrophy arising from chronic retinal disorders, also as a functional and temporary change in many cases in vs^hich there is no organic alteration of the retina, but where the retinal circulation has become inter- rupted. It is known by the papilla being unusually distinct from the rest of the fundus, the want of blood making it look white; and, besides, we see what vessels there are unusually small and colour- less. It seems sometimes to be smaller and more convex than natural, and is often somewhat irregular at its edges ; at other times, it seems to be flattened out, and larger than usual. Around it the circula- tion sometimes has the appearance of being unusu- ally active. Hypercemia of the Papilla—a state coexisting with many affections, acute orchronic, of the posterior tunics—is characterised, on the other hand, by a want of distinctness of the optic papilla; it becoming as highly coloured as the rest of the fundus, and often so very vascular that, even in cases where the entire fundus is hypersemic, it cannot be distinguished, particularly at its margin, from the rest. The chief guide we have in that case is the course of the en- larged vessels. At the same time, we may find, par- ticularly on compression, pulsation of the vessels which are enlarged, isochronous with the pulse at the wrist. c 2