Which layer of the cornea is considered the outermost?

The epithelium is the outermost layer of the cornea and serves several important functions. It acts as a protective barrier against environmental factors such as pathogens and mechanical injury while maintaining the transparency of the cornea. This layer consists of stratified squamous epithelial cells that are tightly packed together, helping to prevent the entry of harmful substances. Additionally, the epithelial layer plays a key role in the hydration and nourishment of the cornea by absorbing nutrients from the tear film. Its ability to renew and repair itself quickly is crucial for maintaining corneal health and visual clarity.

In contrast, Bowman's Layer is situated beneath the epithelium and functions to provide additional structural support. The stroma is the thickest part of the cornea, located deep to Bowman's Layer, and comprises collagen fibers that contribute to the cornea's strength and shape. The endothelium is the innermost layer of the cornea, responsible for maintaining corneal hydration and transparency by regulating fluid levels. This layered structure is essential for the cornea's function but does not interfere with the fact that the epithelium is indeed the outermost layer.