Subjective symptoms in eye diseases / by George A. Berry.

  • Berry, George A. (George Andreas), 1853-
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: Subjective symptoms in eye diseases / 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)

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    part of the field is destroyed to close up to the point of fixation when the rest remains as yet but slightly constricted and the vision of the centre tolerably good. It is interesting to observe the efiect of iridectomy on the glaucoma field of vision. If the disease has been acute, the operation is generally followed by widening, some- times to a very considerable extent. This is also in some degree the case in chronic cases when the measurement of the field before operation has been made at a time when there has been consider- able increase of tension, under which condition part of the limita- tion may be due more to a temporary abolition than to an irretriev- able destruction of the local functional activity. In most chronic cases, however, and always in the true glaucoma simplex, there is cause for congratulation if the extent and acuity of the eccentric vision remains unaltered. Often the restriction becomes slightly greater, a result generally unimportant when compared to the chance of arresting the progress of destruction, but which occa- sionally—viz., when the restriction has at one part been close up to the point of fixation—may, by involving the centre, make all the difference between tolerably useful sight and an amount which is barely sufficient to enable the patient to move about without assiwStance. According to Treitel, the boundaries of the eccentric colour vision are restricted only to the same relative extent as for black and white. Undoubtedly such is often the case, and, as will be seen further on, this is entirely different from the condition in optic atrophy, so that if it be constant it would obviously afford an indication of some diagnostic importance in that class of cases in