Certified Paraoptometric (CPO) Practice Exam 2025

What is the area inside the eye, located behind the iris and in front of the lens?

1. Anterior Chamber

2. Posterior Chamber

3. Vitreous chamber

4. Retinal chamber

The correct answer is: Posterior Chamber

The area located behind the iris and in front of the lens is referred to as the posterior chamber of the eye. This space is filled with aqueous humor, a fluid that helps maintain intraocular pressure, provides nutrients to the eye, and removes waste products. The posterior chamber is part of the anterior segment of the eye, working in conjunction with the anterior chamber to facilitate the flow of the aqueous humor throughout the eye. The anterior chamber is situated in front of the iris, which distinguishes it from the posterior chamber. The vitreous chamber is a larger space located behind the lens and filled with vitreous humor, while there isn't a recognized structure known as the retinal chamber. Therefore, understanding the anatomical arrangement of the eye helps clarify why the posterior chamber is the correct answer in this context.