. Hysteria and neurasthenia : . ntres renders them incapable ofresponding to more than a limited degree ofstimulation at once. Thus if the eye be steadilyfixed on an object, such as the fixation pointof the perimeter, whilst the region of centralvision remains acute, the outer parts of the Aleft Eye ?PX ^^-^r^ V? \«i> A^rn \/\J^=^=\^ «o/ /\\^c\~ —i^vN. Vo hi ^M r~~-/— ^^^^^ ^3^ noV »«0\ 1 . 1*0 /lao Fig. 15.—Moderate contraction of visual for white only. field are inactive. In ordinary vision for dis-tant objects there is a certain degree of visualacuity over the whole field,
. Hysteria and neurasthenia : . ntres renders them incapable ofresponding to more than a limited degree ofstimulation at once. Thus if the eye be steadilyfixed on an object, such as the fixation pointof the perimeter, whilst the region of centralvision remains acute, the outer parts of the Aleft Eye ?PX ^^-^r^ V? \«i> A^rn \/\J^=^=\^ «o/ /\\^c\~ —i^vN. Vo hi ^M r~~-/— ^^^^^ ^3^ noV »«0\ 1 . 1*0 /lao Fig. 15.—Moderate contraction of visual for white only. field are inactive. In ordinary vision for dis-tant objects there is a certain degree of visualacuity over the whole field, because there isno necessity for concentrated attention on onepoint, and therefore the available power of visionis not exhausted as in looking intently at a nearobject. This view is borne out by the well-known fact that the examination of the visual 68 HYSTERIA field in hysteria must not be too prolonged, forif it is unduly protracted a field may be obtainedwhich progressively decreases with the length of Right Fig. 16.—Extreme, contraction of visual fields. Case of hystericalattacks. Disseminated areas of ansesthesia. Field for white,interrupted line ; field for red, continuous line ; field for green,dotted the examination. The method of examinationshould therefore consist of a determination ofthe extent of the field along a few diameters onlyat a time. DISORDERS OF SPECIAL SENSES 69 Hysterical amblyopia is probably an extremedevelopment of the above affection. Cases ofcomplete blindness have been described, but are Left Eye,
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