What are suspensory ligaments primarily responsible for?

Suspensory ligaments, also known as zonules of Zinn, play a crucial role in the eye's anatomy as they connect the ciliary body to the lens. Their primary function is to hold the lens in place, providing stability while allowing it to change shape during the process of accommodation. This is vital for focusing on objects at various distances; as the ciliary muscles contract, the tension on the suspensory ligaments changes, enabling the lens to become thicker for near vision or flatter for distance vision.

In contrast, the other options refer to different parts of the eye or functions. The retina receives visual information and is nourished by other structures, while information transmission to the brain occurs via the optic nerve, and eye pressure is regulated by the aqueous humor and trabecular meshwork. Thus, the specific role of the suspensory ligaments in maintaining lens position is fundamental to the eye's ability to focus and is why this option is the correct choice.