The document summarizes key anatomical structures of the eye and their functions. It discusses the three layers that make up the eye (fibrous outer layer, vascular middle layer, and inner sensitive layer), as well as the three compartments (anterior chamber, posterior chamber, vitreous chamber) and three fluids (aqueous humor, vitreous humor, blood) within the eyeball. Additionally, it provides details on individual structures like the cornea, iris, ciliary body, choroid, lens, vitreous body, retina, optic nerve, and eye adnexa and their roles in vision.