Idiopathic choroiditis is a subject on which we find, in text-books, almost nothing to aid in diagnosis of the disease which has had so little investigation by the busy oculists of the present time.
As you know, the choroid consists of the vascular parenchyma, an exterior coat of endothelium upon its scleral surface, and the lamina vitrea. Upon the latter lies the pigmented epithelium which is assigned to the retina, though it always suffers when the choroid is affected. The blood supply of the choroid is from two groups. The capillary vessels, which lie nearer the inner surface, and the venous to the outer. The chief blood supply is from the short, posterior ciliary arteries. After entering near the optic nerve and piercing the sclerotic they pass into the choroid, then branch, forming the capillary network of the choroid, ending in the indented margin of the ora serrata. Long posterior