It derives most of its blood supply from the layer of blood vessels under it, known as the choroid. This layer, like a sandwhich, is between the white of the eye on the outside, and the retina as the inner most structure. When a retinal tear occurs fluid from within the eye may seep into the tear, separating the retina from the choroid. Recognition of the condition and repair are required immediately. Small slowly enlarging detachments may be treated with laser or cryo -a freezing probe.
Larger detachments require retinal detachment surgery.