Which membrane covers the surface of the eye?

Which membrane covers the surface of the eye?

• A. Iris
• B. Cornea
• C. Retina
• D. Conjunctiva

Answer: (D)

The surface of the eye is covered by the conjunctiva, a thin mucous membrane that sits over the white of the eye (the sclera) and lines the inside of the eyelids. It helps keep the eye moist with small secretions and provides a protective lining against dust and microbes. In contrast, the cornea is the clear front window that helps focus light, the iris is the colored part that controls pupil size, and the retina is the light‑sensitive layer at the back of the eye. Because the conjunctiva specifically covers the anterior surface and folds under the eyelids, it is the membrane described.

The surface of the eye is covered by the conjunctiva, a thin mucous membrane that sits over the white of the eye (the sclera) and lines the inside of the eyelids. It helps keep the eye moist with small secretions and provides a protective lining against dust and microbes. In contrast, the cornea is the clear front window that helps focus light, the iris is the colored part that controls pupil size, and the retina is the light‑sensitive layer at the back of the eye. Because the conjunctiva specifically covers the anterior surface and folds under the eyelids, it is the membrane described.