Under normal circumstances, except for the areas around the optic disc, scleral processes, vortex veins, and ciliary nerves that pass through the sclera in the equatorial region, where the choroid and sclera are tightly connected, the choroid and sclera in most other areas are only loosely connected by a small amount of fibrous connective tissue, and there is a potential gap between the two, which is the suprachoroidal space. The pressure of this space is equal to or slightly less than the intraocular pressure. If this pressure relationship is disrupted, fluid will accumulate in the suprachoroidal space, which is called choroidal detachment. Due to the anatomical continuity of the ciliary body and choroid, choroidal detachment is often accompanied by ciliary body detachment.