The choroidal blood supply refers to the network of blood vessels that nourish the choroid, a layer of tissue located between the retina and the sclera in the eye. This vascular layer is rich in blood vessels and plays a crucial role in providing oxygen and nutrients to the outer layers of the retina, which are essential for maintaining healthy vision. The primary source of blood for the choroid comes from the short posterior ciliary arteries, which branch off from the ophthalmic artery. These arteries form a dense capillary network that ensures adequate blood flow, supporting the metabolic needs of the retinal pigment epithelium and photoreceptors, thereby contributing to overall eye health.