Why the eye is round Tears and their secretion Corneal epithelium and corneal stroma Corneal endothelium Ciliary body and ciliary epithelium The lens The vitreous The retina Retinal pigment epithelium The choroid and optic nerve head Innate and adaptive immunity of the eye. Immunology of the eye with focus on control of intraocular inflammatory responses Drug delivery to the eye The sclera