The fundus oculi, with an ophthalmoscopic atlas illustrating its physiological and pathological conditions.

  • Frost, W. Adams.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: The fundus oculi, with an ophthalmoscopic atlas illustrating its physiological and pathological conditions. 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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    are smaller and more closely aggregated. Plate XXII., Fig. 50, is an instance of this. The progress of the disease being slow, and the patients old, an opportunity of tracing the malady through its various stages seldom arises. A large area of atrophied choroid is, however, often met with, which must be the result of choroiditis in the central region. In such cases the sclerotic often has the appearance of being pushed backwards. The whole patch is usually encircled by pigment, which also sometimes forms an irregular trellis-work over the patch and at a little distance in front of it. Almost complete absence of the choroid at the macula is occasionally met with in young people. In some of these the defect is probably congenital. Examples of this are seen in Plate XXII., Figs. 51 and 52. Both were from young and healthy women, who had only recently discovered that the vision of one eye was defective; but from the advanced condition of the changes, it is obvious that they were not of recent date. Although the affected areas differ in size, they present many points of similarity. In both, there is an area of sclerotic completely exposed, crossed by choroidal vessels. In both, this is bounded by a pigment ring, which overhangs it, and with the ophthalmoscope was obviously anterior to it. The pigment forms a network with numerous openings, through which the sclerotic is visible. In Fig. 53 the area of pigment deposit is considerably larger than that of the atrophy. Such cases as these are considered by many to be examples of defective development of the choroid, and hence are called coloboma of the yellow spot. It seems to me that the presence of extensive pigmentary changes rendei-s this view highly improbable, and that the presence of choroidal vessels disproves it. It is more probable that the condition is the result of a localised choroiditis occurring in early childhood. Isolated patches of choroiditis, or the results of former attacks.