👉 Choroid is a structure in the retina of the eye, which is responsible for visual perception. It consists of two layers, the anterior and posterior layers, each containing pigmented cells called photoreceptors. The choroidal pigment contains melanin, which provides visual information to the brain as an image. The term "choroid" refers to the structure that surrounds the retina in the eye and plays a crucial role in the function and perception of vision.