Summary of Development of the eye
The eyes develop around the fourth week as outpocketings of the forebrain, called optic vesicles. They therefore have a neuroectodermal origin. The vesicles continue their development by invaginating and forming a double-walled optic cup. They will generate the retina, optic nerve, ciliary and iris epithelium, and pupil constrictor and dilator muscles. The lens has an ectodermal origin, coming from the lens placode, a thickening of surface ectoderm overlying the optic cup. The choroid and cornea have the same mesenchymal origin.