The eyeball consists of the eyeball wall and its contents.

Eyeball: it is divided into eyeball wall and contents.

1. Eye wall: It is divided into outer membrane (fibrous membrane), middle membrane (vascular membrane) and inner membrane (retina).

Adventitia (fibrous membrane): It is divided into cornea and sclera.

Media (vascular membrane): It is divided into iris, ciliary body and choroid.

Intima (retina): It is divided into iris, ciliary body and visual part.

2. Contents: aqueous humor, lens and vitreous body.