The different parts of the eyeball model are detachable to show the following structures. 1. Tunica external: showing cornea and sclera with attachments of ocular muscles and optic nerve. 2. Tunica media: showing the iris, the ciliary body and the chorioid. 3. Tunica internal is retina. 4. Refraction media: showing the lens and the vitreous body. 6 times enlarged. On stand.