Fibrous tunic cornea sclera wall iris Vascular tunic ciliary body Globe choroid Retina Eye Lens system (refraction) 额突 Accessory structures 提上睑肌 上直肌 结膜上穹 虹膜 视神经 角膜 上险 外直肌 下睑 结膜下穹 眼轮匝肌 下直肌下斜肌Fibrous tunic cornea sclera wall iris Vascular tunic ciliary body Globe choroid Retina Lens system (refraction) Accessory structures Eye