Final answer:
The lens is held in place by suspensory ligaments that extend from the ciliary body, which adjusts the lens's shape for proper focusing on the retina.
Step-by-step explanation:
The lens of the eye is held into position by suspensory ligaments which extend forward from the ciliary processes. These ligaments are also known as zonule fibers and play a crucial role in the focusing ability of the eye. The ciliary body, to which the suspensory ligaments are attached, alters the shape of the lens to focus light correctly on the retina. The retina then captures the light and converts it into nerve signals, which are sent to the brain via the optic nerve. This adaptive mechanism allows the eye to produce clear images for objects at varying distances.
The choroid, a highly vascularized tissue layer, supplies blood to the eyeball and is situated behind the ciliary body. Lastly, the iris, which forms the colored part of the eye, controls the amount of light entering by adjusting the size of the pupil.