The ocular blood supply refers to the network of blood vessels that deliver oxygen and nutrients to the eye. The primary source of blood supply comes from the ophthalmic artery, a branch of the internal carotid artery. This artery branches into several smaller vessels, including the central retinal artery, which supplies the retina, and the ciliary arteries, which nourish the outer layers of the eye. Veins in the eye, such as the central retinal vein, drain deoxygenated blood back to the systemic circulation. Proper blood supply is crucial for maintaining the health and function of the eye, as any disruption can lead to vision problems or other ocular diseases.