A case of tobacco amblyopia presenting unusual defects in the visual fields : and a case of optic atrophy complicating beri-beri / by F. O'Kinealy.

  • O'Kinealy, F.
Date:
[1901]
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Credit: A case of tobacco amblyopia presenting unusual defects in the visual fields : and a case of optic atrophy complicating beri-beri / by F. O'Kinealy. 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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    ( ~ ) The croRsinoj of the boundaries for colours occurring in tiie later fields, is ))r(>l)ably due to the retinal asthenopia which was present at the tikiie of exaniinatlon. The abolition of the field for yellow is excep- tional, but the improvement that has al-ready taken place in. the peiception of the other colours, encourages hopes of its restoration. With regard to the second case, it may be noted that Manson^ h)oks upon implication of the nerves of sight as vejy exceptional in beri-beri. Knies^ mentions that the occunence of optic atrophy in this disease has been reported by Laurengao and by Kessler. The latter observer also noticed that contiaction and insufiicient filling of the retinal arteries, with white sheaths ai(»und tlie artei'ies and veins, accompanied atrophy of the papilla In the present case the optic atrophy is attributable to the beri-beri, but the origin of the choroidal changes is doubtful. Supplementary ^ote on Case I.—Since the above was written the patient has presented himself for further examination, the result of which is as follows : — May 5th. 1901.—Distant vision unaltered. Near vision improved : R, = Jaeger 10 imperfectly, r. 4- 2-75 D Sph. = Jaeger 1 fairly L = Jaeger 12 imperfectly, c -(- 3 D Spli = Jaeger J fairly. B.E. = Jaeger 10 with difficulty, il + 2 7.5 D Sph -r Both fields of vision remain somewhat contracted, especially outwards ; but the scotomata for green have disappeared, while the j)erception of yellow has returned at the fixation point, extending 10° outwards and 5° up- wards from it in the right eye, and 5° outwards in the left. There is still a certain amount of retinal asthenopia. 1 Allbutfc's System of Medicine. Vol. II. ® The Kye in General Di!<e;ises,