Text-book of ophthalmology . Thus, the acuity of vision and the extent of the visual field changefrequently (usually doing so as the other hysterical symptoms grow better or worse);the relations of the color limits within the visual field are not in accordance with therule (the limits for red, instead of being narrower than those for blue—see page125—, are usually wider [or cross them in places—reversal and interlacingof color fields]); these relations are not properly proportioned to the totalextent of the visual field; persons whose visual field is unusually contracted still movewith perfect
Text-book of ophthalmology . Thus, the acuity of vision and the extent of the visual field changefrequently (usually doing so as the other hysterical symptoms grow better or worse);the relations of the color limits within the visual field are not in accordance with therule (the limits for red, instead of being narrower than those for blue—see page125—, are usually wider [or cross them in places—reversal and interlacingof color fields]); these relations are not properly proportioned to the totalextent of the visual field; persons whose visual field is unusually contracted still movewith perfect security and without stumbling in a space which is not well known to them;in fact, even in those who are absolutely blind we sometimes find the same thing occurif they think that they are not observed. Furthermore, the pupillary reflex to lightis retained even when the blindness is complete. It can be seen from these statementsthat it is often difficult to draw the line between simulation and a hysterical blindness—. Bight Fig. 282. Fig. 281.[The Visual Field in Hysteria. (After De Schweinitz in Posey and Spiller.)281.—Contracted field (in this ease a tubular field) with partial reversal of color fields, b, fieldOf blue, r, field for 282.—Contracted and oscillating field (Wilbrand). The dark fines denote scotomata.—D.] Fig. i. e., one having an actual existence in the imagination. In the latter case there maybe other evidences of hysteria associated with the symptoms of the hysterical amblyopiawhich will render the diagnosis more certain. [Yon Reuss has called attention to the fact that in hysteria the involvement of thefield is apt to remain constant, while in neurasthenia it is variable (Peters).—D.] Hysterical amblyopia chiefly attacks young people, particularly of the femalesex. It is sometimes produced by injuries, even when they do not affect the eye itself(traumatic neurosis). Hysterical amblyopia affords a good prognosis, as ordinarilya complet
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