Which of the following corneal layers plays a crucial role in nutrient absorption?

The epithelium is the outermost layer of the cornea and plays a pivotal role in absorbing nutrients essential for maintaining corneal health and transparency. This layer is responsible for protecting the underlying structures of the cornea from environmental damage and facilitates the movement of nutrients from the tear film into the cornea.

The epithelium contains microvilli that increase its surface area, enhancing the absorption of nutrients and oxygen, which are essential for the metabolic functions of the corneal cells. Moreover, the epithelial cells are connected by tight junctions, which help maintain the barrier function while allowing for the selective transport of nutrients.

In contrast, while other layers of the cornea, such as the stroma, endothelial layer, and Bowman’s layer, have their unique functions, they do not primarily engage in nutrient absorption. The stroma provides structural support and contains collagen fibers, Bowman’s layer serves as a transition between the epithelium and the stroma, and the endothelium is crucial for maintaining corneal hydration and transparency but not directly involved in nutrient absorption.