What structure provides lubrication for the eye?

Tears play a crucial role in maintaining the health and lubrication of the eye. They are produced by the lacrimal glands and contain a mixture of water, oils, and mucus, which forms a protective film over the surface of the eye. This film not only helps to keep the eye surface moist but also provides essential nutrients, removes debris, and protects against infections. The consistency and distribution of tears are vital for maintaining comfort and clear vision.

In contrast, while aqueous humor and vitreous humor are important fluids within the eye, they primarily serve different functions such as maintaining intraocular pressure and filling the eye cavity. The cornea, although it has a role in vision and overall eye structure, does not provide lubrication on its own; it relies on the tear film for that purpose. Thus, tears are the primary source of lubrication for the eye, making them the correct choice in this context.