Abstract
ON a cycling tour recently, after riding some forty miles, with much hill-climbing and against a strong wind, I lay down on a grassy bank facing the east, towards sunset. Viewing the clear eastern sky, I obtained a most remarkable view of my own retinal circulation. A companion also got an excellent view of his own blood corpuscles. The apparent circulation occupied a considerable portion of the visual field, and a most vivid conception was obtained of the relative slowness of movement in the capillaries. It occurred to me afterwards that the reason of the phenomenon was the hyperæsthesia of the retina, caused by the dilatation of the arterioles, which is a characteristic of excessive cycling. It would be interesting to learn whether others have obtained similar experiences.
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BARRETT, J. An Excellent View of the Retinal Circulation. Nature 53, 510 (1896). https://doi.org/10.1038/053510b0
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DOI: https://doi.org/10.1038/053510b0
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