Observations on hemeralopia; or, Nocturnal blindness, with cases, and practical illustrations / by Andrew Simpson.

Date:
1819
Catalogue details

Licence: Public Domain Mark

Credit: Observations on hemeralopia; or, Nocturnal blindness, with cases, and practical illustrations / by Andrew Simpson. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    labour under this defect, and that they are unable to pick up small grains in the dusk of the evening, and is said to be a common affection in Russia. The adoption and definitions, of amblyopia, by the two nosologists Sauvage and Vogel, are in these words: and first by Sauvage, “Visus de- bilitas respective, ad situm, gradum lucis, distanti- am objecti, oculis pellucidis.” And by Vogel, “ Vi- sits imbecillitas integro oculo.” Cullen objects to these definitions, probably from their implying an apparent soundness of the organ; but in this re- spect his objection is not so important as he was led to suppose. The affection under examination is the Hemera- lopia of Greek authors, of Plenck, &c. The “ visusdiurnus” of Bocrhaave: the “ Nyctalopia” of several later writers. But here the ancients are not altogether excluded. The “ Amblyopia crep use u laris” of Sauvage: the “Dysopia tenebra- rum” of Cullen: the “ Shebkeret” of the Arabians (the learned Mr. Good’s Nosology): the “Nacht- blinkeit” of the Germans (Idem ibidem).—This affection of the eyes, whether considered sympa- thetic or idiopathic, shall for the present continue under his 94th genus, in the order Dysesthesia', and class Locales, cnostituting the “Dysopia” Culleni, and the Generic Definition is “Visus de- pravatus, ita ut non nisi certa luce, vel ad cer- tain distantiam, vel in certa positura, objecta clare