system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All are parts of anterior segment of eye except
assistant
The correct answer is  o The eyeball is divided into two segments : -
A. Anterior segment 

Part of eyeball anterior to posterior border of lens is called anterior segment.
It consists of lens, and structures anterior to it, i.e., cornea, iris and two aqueous humor-filled spaces, i.e., anterior and posterior chambers.

i. Anterior chambers : - It is bounded anteriorly by back of cornea and posteriorly by the iris & part of ciliary body. It contains aqueous humor.
ii. Posterior chamber: - This triangular chamber is bounded anteriorly by the posterior surface of the iris & ciliary body and posteriorly by the lens and it zonules. It also contains aqueous humor. Thus, both anterior and posterior chambers are part of anterior segment and both contain aqueous humor.
B. Posterior segment 

Part of eye ball posterior to lens is called posterior segment.
It consists of vitreous humor, retina, choroid and optic disc.