Subjective symptoms in eye diseases : being chapters on the disorders of vision symptomatic of diseases in the eye and central nervous system / by George A. Berry.

  • Berry, George A. (George Andreas), 1853-
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: Subjective symptoms in eye diseases : being chapters on the disorders of vision symptomatic of diseases in the eye and central nervous system / by George A. Berry. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    108/126 (page 104)
    consideration of the • concomitant symptoms as well as by the extent and configuration of the blind area. A very able attempt has recently been made by Wilbrand1 to make use of the data afforded by the thorough subjective examination of cases of hemianopia, in order to arrive at a refinement in the diagnosis of the site of the lesion. Wilbrand's work, though very suggestive, is necessarily to a considerable extent theoretical. He keeps constantly before him, however, the results of numerous post-mortem examinations which he has collected, and the views he expresses are not inconsistent with the known pathology of the subject. An analysis of the subjective symptoms of hemianopia cases shows that:—1. When in any homonymous portions of the fields of vision there is a defect in the light sense, the defects in the senses of form and colour are at least quite as extensive. 2. When the light sense remains intact, but a homonymous defect exists for form, this is always accompanied by at least as exten- sive a defect for colours. Wilbrand therefore concludes that the nerve fibres connected with the centres for the senses of colour and form pass through the light sense centre. As, too, there are cases on record where the colour sense alone in the halves, or in some particular homonymous sections of the fields of vision, had disap- peared, as well as cases where both colour sense and form sense had disappeared from similar portions, leaving, however, the light sense intact in these portions, Wilbrand draws the further conclu- sions that the centre for form must lie between those for colour and light, while that for colour must at the same time occupy the most central position in the brain. Many examples of actual cases are given in Wilbrand's monograph of all the combinations which are possible on the above assumptions. When the hemianopia is partial, the defect is generally, though not always, of equal extent in both eyes. Tigs. 8 and 9 are examples of both forms which I have met with. Hemianopia remains, as a rule, stationary, even although the subjective symptoms become in many cases, after some time, 1 Ophthalmiatrische Beitraege zur Diagnostic tier Gehim - Krankhtitcn. (Wiesbaden, 1884.)