Which statement about the cornea epithelium is true?

Which statement about the cornea epithelium is true?

• A. A thin multicellular epithelial tissue layer of fast growing and easily regenerated cells while being kept moist with tears.
• B. It is a vascularized connective tissue.
• C. It provides most of the cornea's refractive power.
• D. It is the deepest layer next to the aqueous humor.

Answer: (A)

The cornea epithelium is the outermost surface layer of the cornea: a thin, multicellular, stratified squamous epithelium that renews rapidly when damaged. It is kept moist by the tear film and is avascular, relying on nutrients from tears and the underlying stroma. This combination—being a thin epithelial sheet that turns over quickly and stays moist with tears—is why the statement in the option is true. The cornea is not a vascularized connective tissue, so that part is incorrect. The deepest layer next to the aqueous humor is the endothelium, not the epithelium. And while the epithelium helps form the optical surface, most of the cornea’s refractive power comes from the stroma and the anterior surface, not primarily from the epithelium.

The cornea epithelium is the outermost surface layer of the cornea: a thin, multicellular, stratified squamous epithelium that renews rapidly when damaged. It is kept moist by the tear film and is avascular, relying on nutrients from tears and the underlying stroma. This combination—being a thin epithelial sheet that turns over quickly and stays moist with tears—is why the statement in the option is true. The cornea is not a vascularized connective tissue, so that part is incorrect. The deepest layer next to the aqueous humor is the endothelium, not the epithelium. And while the epithelium helps form the optical surface, most of the cornea’s refractive power comes from the stroma and the anterior surface, not primarily from the epithelium.