16 week fetal eye (cross section)

3D Model

Although eye development can be considered from an embryological perspective to commence around day 22, when the optic sulci (optic primordium) appear as shallow grooves or pits in the inner aspect of the neural plate or neural folds ( Fig. 2-1A ) and the embryo is around 2 mm in length with eight somites, the group of cells that constitute the eye primordium or eye field have already begun to express a set of ‘eye field transcription factors’ (EFTFs) that are highly conserved in our evolutionary ancestory

References :- 1- Larsen’s Human Embryology textbook ( Sixth Edition ). 2- the anatomy of human embryo electron microscope textbook ( 1st Edition ) . 3-langman medical embryology textbook( Fourteenth Edition ) .