What is the major vascular layer inside the eye called?

The major vascular layer inside the eye is known as the choroid. This layer is situated between the retina and the sclera, which is the white outer layer of the eyeball. The choroid is rich in blood vessels, and its primary function is to supply nutrients and oxygen to the outer layers of the retina as well as to remove waste products. This blood supply is crucial for maintaining the health and function of the retinal tissues, ensuring that photoreceptors that are vital for vision can operate effectively.

Other structures listed, such as the retina, are primarily involved in the processing of visual information rather than vascular supply. The cornea is the transparent front part of the eye that helps focus light, while the ciliary body primarily controls the shape of the lens for focusing and produces aqueous humor. While these parts are essential for vision, they do not serve as the main vascular layer of the eye.