iris eye , vitreous eye , eyelid anatomy

Iris

• Both layers of epithelium are derived from
  the marginal region of optic cup (neuroectodermal)
• Sphincter and dilator pupillae muscles are
  derived from the anterior epithelium (neuroectodermal).
• Stroma and blood vessels of the iris develop
  from the vascular mesenchyme present anterior
  to the optic cup.

Vitreous
1. Primary or primitive vitreous is mesenchymal in
origin and is a vascular structure having the
hyaloid system of vessels...

2. Secondary or definitive or vitreous proper is
secreted by neuroectoderm of optic cup. This is
an avascular structure. When this vitreous fills
the cavity, primitive vitreous with hyaloid vessels
is pushed anteriorly and ultimately disappears.

3. Tertiary vitreous is developed from neuroectoderm
in the ciliary region and is represented
by the ciliary zonules

Eyelids
Eyelids are formed by reduplication of surface ectoderm above and below the cornea . The folds enlarge and their margins meet and fuse with
each other. The lids cut off a space called the conjunctival sac. The folds thus formed contain some mesoderm which would form the muscles of the lid and the tarsal plate. The lids separate after the seventh
month of intra-uterine life. Tarsal glands are formed by ingrowth of a regular row of solid columns of ectodermal cells from the lid
margins. Cilia develop as epithelial buds from lid margins.

Development of the eyelids, conjunctiva and
lacrimal gland.