Image from page 878 of “Practice of medicine” (1901)

Image from page 878 of “Practice of medicine” (1901)
Eyes Vision
Identifier: practiceofmedici02gibs
Title: Practice of medicine
Year: 1901 (1900s)
Authors: Gibson, George Alexander, 1854-1913
Subjects: Medicine
Publisher: Philadelphia : Lippincott
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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rned. This was originally pointed outby Bastian, who first propounded the view that the so-called motor areasof the cortex are not really motor in function, but are the regions of thecortex in which tactile and muscular sense impressions are stored. Theterm kintesthesis was introduced by Bastian to describe this function, andhe pointed out, or rather insisted, that the paralysis resulting from loss offunction of this part of the cortex is due to inabihty to ideate the move-ments wliich it is desired to perform—which movements are acquiredchiefly or entiiely as a result of education or voluntary imitation. Disorders of the special senses.—Sight.—Complete blindness is rarein hysteria, but some degree of amblyopia is very common. The amblyopiais usually one-sided, and, according to Pitres, exists in monocular visiononly, disappearing dm-ing binocular vision. Hemianopsia and centralscotomata never exist in pure hysteria. There is no decrease in the FUNCTIONAL NERVOUS AFFECTIONS. 853

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Fig. 27.—Visual field of the normal left eye. Theareas marked represent from without inwardsthe fields for white, blue, yellow, orange, red,green, aud violet light.—After Charcot. acuity of vision, but photophobia is common. Colour vision may beentirely lost, everything seenappearing grey, a condition ofpure achromatopsia. Concentriccontraction of the fields ofvision is a fairly common con-dition, and whilst it is usuallymost marked in one eye, it isgenerally, as was first pointedout by Landolt, present to someextent in both. If this contrac-tion exists to a marked degreefor white light, it is not unusualto find the red field more ex-tensive than the white. Theamount of contraction varies inindividuals, and may be to afew degrees only, or centralvision alone may be left (seediagrams in Fig. 27). Whenthere is affection of colourvision, the contraction, accord-ing to Charcot, from the leastto the best preserved colour, isin order—violet, green, blue, yellow, and red, or more rarel

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