What does eyelash extension application involve?

The process of eyelash extension application focuses on applying a semi-permanent fiber to enhance the length and volume of the natural eyelashes. This procedure typically involves adhering individual synthetic fibers to each natural lash using a special adhesive. The key aspect of this process is that it enhances the natural lashes without altering them in terms of cutting or perming.

The other options, while related to eyelash beautification or alteration, do not accurately describe the specific procedure of applying eyelash extensions. Cutting and styling would pertain more to eyelash grooming rather than extension application, perming refers to curling the natural lashes, and coloring involves dyeing the eyelashes, none of which align with the primary method of enhancing lashes through the use of semi-permanent fibers. Therefore, the correct answer focuses on the specific technique that makes eyelash extensions distinctive in the realm of cosmetic applications.