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

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)

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$oval field which stretches temporally from the macula to about 50\ Subsequently the functions of the central portions up to the nerve become also destroyed, and there remains vision only in a small temporal strip, which after wavering between existence and non- existence is also finally lost. Bunge considers that this typical series of successive invasion of definite portions of the field is J® strongly suggestive of the excavation of the nerve being the cause of the limitation. The defects produced by choroiditis or optic atrophy are essentially different, while pressure on the nerves or vessels of the retina is an unlikely cause, as on such an assumption it would be difficult to explain why there is so frequently such a marked temporal sector of the field left relatively undisturbed. While there is much to be said in favour of this view, it must still be considered doubtful what circumstance it is which mainly leads to the defects of the peripheral vision in glaucoma. It is interesting to observe the effect of iridectomy on the glau- coma field of vision. If the disease has been acute, the operation is generally followed by widening, sometimes to a very considerable$