Choroidal circulation refers to the blood flow within the choroid, a layer of blood vessels located between the retina and the sclera in the eye. This circulation is crucial for supplying oxygen and nutrients to the outer layers of the retina, which are essential for maintaining healthy vision. The choroid is rich in blood vessels, allowing it to efficiently deliver these vital substances. The choroidal blood supply primarily comes from the short posterior ciliary arteries, which branch off from the ophthalmic artery. Proper choroidal circulation is important for preventing conditions such as choroidal neovascularization and other retinal diseases that can lead to vision loss.