The student's guide to diseases of the eye . me of theseappearances undoubtedly result from large choroidalor retinal extravasations, but the nature of the dis-ease in such as Fig. 71 is obscure.—In another form,along with superficial atrophy, the large deep vesselsare much narrowed, or even converted into white linesand devoid of blood column, by thickening of theircoats.—In another form the central region is occupiedby a number of very small, white, or yellowish-whitedots, sometimes visible only in the erect form in typical cases is very peculiar, andappears to be almost stationar
The student's guide to diseases of the eye . me of theseappearances undoubtedly result from large choroidalor retinal extravasations, but the nature of the dis-ease in such as Fig. 71 is obscure.—In another form,along with superficial atrophy, the large deep vesselsare much narrowed, or even converted into white linesand devoid of blood column, by thickening of theircoats.—In another form the central region is occupiedby a number of very small, white, or yellowish-whitedots, sometimes visible only in the erect form in typical cases is very peculiar, andappears to be almost stationary; the discs are oftendecidedly pale; when very abundant the spotscoalesce, and some pigmentation is found. Thepathological anatomy and general relations of thisdisease are incompletely known ; it has been clinicallydescribed by Hutchinson and Tay, and is tolerably 12 178 DISEASES OF THE CHOROID common. It is symmetrical and the changes maysometimes be mistaken for a slight albuminuric re-tinitis (p. 185). No treatment seems to have any. Fig. 71.—Central choroiditis (VVecker and Jaeger). influence. Every case of immature cataract should,when possible, be examined for central choroidalchanges. (4.) Anomalous forms of choroidal disease. —Single,large patches of atrophy, with pigmentation, and notlocated in any particular part, are occasionally metwith. Probably some of them have followed theabsorption of tubercular growths in the choroid,while others are the result of large spontaneoushaemorrhages (p. 173) ; such patches towards thefront of the fundus may follow blows by bluntobjects on the overlying sclerotic, which caused hae-morrhage, or inflammation, and subsequent atrophy.—Single large patches of exudation are also metwith, and are, perhaps, tubercular (see p. 128).—Choroidal disease in disseminated patches seems some-times to depend upon numerous scattered haemor- DISEASES OF THE CHOROID 179 rhages into the choroid, sometimes occurring repeat-edly at different d
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