The cerebral lesions in a case of complete acquired colour-blindness / by George Mackay and James Crauford Dunlop.

  • Mackay, George, 1861-1949.
Date:
[1899]
Catalogue details

Licence: Public Domain Mark

Credit: The cerebral lesions in a case of complete acquired colour-blindness / by George Mackay and James Crauford Dunlop. 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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    Acqtiired Colour-Blindness On January 26th, 1898, Dr Mackay saw him, along with Dr Dunlop, and noted his condition as follows :— External aspect of eyes natural. No obvious signs of blindness. Patient recognised faces, and walked about freely. Pupils medium size, equal, reacting to light and on convergence. Fig. 1.—Field of right eye for i cm. sq. of white paper. Ext. muse. — Movements good. Oph. Exam.—Media clear. Optic discs slightly senile and anaemic, but not atrophic. Vessels well proportioned. Fundus generally healthy. Re- fraction emmetropic. V = ^2 Sn. with each eye separately, and attempts at % Sn. c + 4 D sph. = J. I with each eye. Fields of Vision.— Fields for hand movements apparently good; for counting fingers eccentrically curtailed ; for a I cm. square of white paper restricted in the right eye to an area not exceeding 5° inwards, upwards, and downwards, and to 7° outwards {i.e. to the right) from the fixation point; in the left eye to an area which only exceeded 10° at the inner side extending there {i.e to the right) to i^ in the hori- zontal plane. The fields were taken with a Priestly Smith's peri- meter. The size of the fields may have been influenced to some extent by fatigue, the left eye having been ex- amined first. If we regard the case as one of double homonymous hemianopsia, the left half' fields of both Fig. 2,—Field of left eye for 1 cm. sq. of white paper. eyes were more affected tha,n the right.