Before the diseases of the choroid are reviewed, a few salient facts regarding the anatomic structure and the function of the choroid will be briefly mentioned.
The choroid lies between the retina and the sclera and extends from the optic disk to the ora serrata. It has a thickness of 0.3 mm. and is composed mainly of veins and arteries, principally the former. These vessels anastomose. The intravascular stroma is made up of elastic fibers, connective tissue fibers, chromatophores and nerves.
The following layers of the choroid can be distinguished from without inward : (a) the suprachoroidal space, consisting of elastic fibers and cells; (b) a layer of large blood vessels, the thickest layer of the choroid; (c) a layer of medium-sized blood vessels; (d) the choriocapillaris, a single layer of capillary blood vessels, and (e) the lamina vitrea, an elastic membrane. The choroidal vessels are branches of the ciliary vessels,
COHEN M. DISEASES OF THE CHOROID. Arch Ophthalmol. 1939;21(3):522–526. doi:10.1001/archopht.1939.00860030130016
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