The fundus oculi, with an ophthalmoscopic atlas illustrating its physiological and pathological conditions.

  • Frost, W. Adams.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: The fundus oculi, with an ophthalmoscopic atlas illustrating its physiological and pathological conditions. 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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    ANATOMY. centralis. Recent investigations by Dimmer* have shown that the depression commences at the border of the macula, and shelves down gradually to the centre, where sometimes there is another, smaller, depression. This small and occasional depression cor- responds with the white spot seen with the ophthalmoscope, and hitherto called the fovea centralis; Dimmer would call this the foveola, using the term fovea as synonymous with macula. If we accept these views, the ophthalmoscopic appearances are brought into harmony with the anatomical structure. Thus, the reflex ring is at once explained by light being reflected from the slightly raised convex edge of the depression. The thinning of the retina within the area explains the colour of the macula. In pigmented eyes this is often dark from the pigment of the choroid showing through, while in lighter eyes, the capillary layer of the choroid gives it a richer red. Of the anatomical modilica- tions of this part, the most 1 Beitriige zur Anatomie und Physiologic der Macula lutea des Menschen, 1894.