What does the conjunctiva line?

The conjunctiva is a clear, thin membrane that serves a vital role in eye health. It covers the inside of the eyelids and extends over the front surface of the eyeball up to the edge of the cornea. By doing so, it facilitates a smooth surface for eyelid movement and provides protection against infections and foreign particles. This membrane also helps to keep the eye moist by producing mucus and tears.

The choice that identifies the conjunctiva as lining both the inside of the eyelids and the front of the eyeball accurately reflects its anatomical function and distribution. It's important to note that the other options do not encompass the full extent of the conjunctiva's coverage, leading to an incomplete understanding of its role in ocular health.