Eyestrain (commonly called asthenopia) / by Ernest Clarke.

Ernest Clarke

Date:: 1892

Credit: Eyestrain (commonly called asthenopia) / by Ernest Clarke. Source: Wellcome Collection.

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$vagus have a connection with the middle lobe of the cerebelhim. ^ Insomnia.—In a paper on General Neuroses having an Ophthalmic Origin, ^ Hewetson, of Leeds, says, This particular symptom I observed in many cases the subjects of astigmatism, and he mentions a case of a University man suffering from insomnia ; he was astig- matic, and after the error was corrected the insomnia disappeared, although he was doing the same amount of reading. Ranney^ and Ellis* also cite numerous cases of sleep- lessness cured by relieving the refractive or muscular defect of the eyes. Insomnia is a complaint that may not be volunteered, but that can be elicited from many patients who are the subjects of severe asthenopia. The hyperaemia of the brain, the headaches, and the general low tone of the nervous system easily explain the phenomenon. Eyestrain tends to produce or increase myopia.—One effect of unrelieved eyestrain is to produce increased intraocular pressure through the congestion of the vessels, and con- sequent myopia. In a paper on Some Remarks on Asthenopia and Changes of Refraction, ^ Norris has drawn attention to this and cited cases. V. The Relation between Eyestrain and Severe Neuroses.—At the present day, the universal recognition of asthenopia as the cause of many troubles, that formerly were not supposed to be in any way connected with it. ' Op. cii., vol. ii., p. 724. Section of Ophthal, Brit. Med. Assoc. Meeting, 1888. ^ New York Med. Jourti.^ June 11, 1892. * Ibid, April 30, 1892. ■■' Trans, of the American Ophth. Soc, vol. iv., p. 369.$

Eyestrain (commonly called asthenopia) / by Ernest Clarke.

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