What membrane covers the inner surface of the eyelids and the exposed surface of the eye?

What membrane covers the inner surface of the eyelids and the exposed surface of the eye?

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

Answer: (B)

The conjunctiva is a thin, transparent membrane that plays a crucial role in eye health. It covers the inner surface of the eyelids and also extends over the exposed surface of the eye, except for the cornea. Its primary function is to provide a protective barrier against dust, debris, and microorganisms, while also helping to lubricate the eye by producing mucus and tears. This lubrication is essential for preventing dryness and ensuring smooth movement of the eyelids across the surface of the eye. The retina is an inner layer of the eye responsible for converting light into neural signals, but it doesn't cover the eyelids or the outer surface of the eye. The cornea is the clear, dome-shaped surface that covers the front of the eye, allowing light to enter, but it does not extend to the inner eyelids. The sclera, known as the "whites" of the eye, provides structural support and protection for the eye but does not serve as a lining for the eyelids or the exposed surface of the eye. Thus, the conjunctiva is the only option that correctly fits the description in the question.

The conjunctiva is a thin, transparent membrane that plays a crucial role in eye health. It covers the inner surface of the eyelids and also extends over the exposed surface of the eye, except for the cornea. Its primary function is to provide a protective barrier against dust, debris, and microorganisms, while also helping to lubricate the eye by producing mucus and tears. This lubrication is essential for preventing dryness and ensuring smooth movement of the eyelids across the surface of the eye.

The retina is an inner layer of the eye responsible for converting light into neural signals, but it doesn't cover the eyelids or the outer surface of the eye. The cornea is the clear, dome-shaped surface that covers the front of the eye, allowing light to enter, but it does not extend to the inner eyelids. The sclera, known as the "whites" of the eye, provides structural support and protection for the eye but does not serve as a lining for the eyelids or the exposed surface of the eye. Thus, the conjunctiva is the only option that correctly fits the description in the question.