What is the primary function of mascara?

The primary function of mascara is to enhance the appearance of eyelashes, focusing particularly on their thickness. When applied, mascara creates a fuller look by coating each individual lash, which can make eyelashes appear thicker and more defined. This is often a critical aspect of eye makeup because thicker lashes help to frame the eyes and enhance overall facial features, giving a more dramatic and eye-catching look.

While mascara does indeed lengthen eyelashes to some degree, and it also colors them and may even condition them depending on the formulation, the main purpose of traditional mascara products is to create a thicker, more voluminous effect. Thus, the emphasis on increasing thickness is what sets it apart as its primary function.