Which of the following components of the tears serves to lubricate the eye?

The oily component of tears plays a crucial role in lubricating the eye. This layer, known as the lipid layer, is produced by the meibomian glands located in the eyelids. Its primary function is to reduce evaporation of the tear film, thereby keeping the surface of the eyes moist and comfortable. By maintaining this moisture, the oily component helps to prevent dryness and irritation, allowing for smooth eyelid movement over the surface of the eye during blinking.

The other components of tears, while important for overall tear function and eye health, do not primarily serve the lubrication purpose. The watery component primarily provides hydration and supplies nutrients to the corneal cells. The cellular component includes various cells that are part of the immune response and help protect the eye from infection. The muscle component is not part of tear composition; rather, it refers to the muscles around the eye that facilitate movement and positioning. Therefore, when considering the specific task of lubrication, the oily component is essential and functions effectively in this capacity.