Extra-papillary colobomata / by G. Lindsay Johnson.

  • Johnson, G. Lindsay (George Lindsay), 1853-1943.
Date:
[1890]
Catalogue details

Licence: Public Domain Mark

Credit: Extra-papillary colobomata / by G. Lindsay Johnson. 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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    Under this layer of pigment portions of the choroid are seen in an altered form. The choroidal vessels which pass into view from beneath the free edge of the coloboma unite together to form a dense impenetrable plexus towards the centre of the coloboma, which bears the closest resemblance to naevi seen elsewhere (see Plate I., Fig. 2, Plate V., Fig. 10, Plate VII. and Plate VIII). Naevi of the choroid and other tunics of the eye are not altogether unknown. Thus Lawford ' gives a drawing of a microscopic section of the choroid in which there are unmistakable signs of a naevus, and he concludes that, ''a priori, one feels inclined to say that the choroid, with its unusually vascular structure, would be a not unlikely situation for the development of a naevus. Horrocks describes a case in which a port-wine colored naevus in the face was observed along with a naevus in the sclerotic and cornea, while the retinal vessels are extremely tortuous. Dr. Sturge' describes a case in which a congenital port-wine mark on one side of the face coincided with tortuous retinal vessels, and changes in the choroid on the same side. Lastly, Dr. Mines'* men- tions a case of naevus of the choroid accompanied by a de- tachment of the retina. The face was also marked by a large naevus. Conclusion.—The cases published herewith will, I believe, already suffice to demonstrate that extra-papillary colo- bomata are not of as rare an occurrence as have been hitherto supposed, and I may add that whilst writing this paper I have observed several other cases, which only con- firm what I have herein stated. I believe it will be found that they are not difficult to diagnose, and that with the exception of those cases which include the macula they do not impair the vision beyond causing a limitation of the field (unless they are so large as to weaken the resistance of the globe). ^ Trans. Oph. Soc, vol, v., p. 138. - Trans. Oph. Soc, vol, iii., p, 106. See also Perrin and Poncet's Atlas of Path. Anat. of the Eye, where a case described by them as Congestion of Choroid is believed by Dr. Lawford to have been a nsevus. ^ Clin. Soc. Trans., vol. xii., 1879, ?• 1^2. * Trans. Oph. Soc, vol. iv., p. 168.