Eyelashes don't feel sensitive, why is that?

Interesting question: This is a very rare symptom. The eyelashes are normally very sensitive to the lightest touch, but this a function of the sensitivity of the skin at the follicle. Anything causing reduced sensation of the eyelid skin could cause this. This can be from a dysfunction of the trigeminal nerve that supplies sensation to the face, a prior viral infection (herpes, shingles), or a neurological problem.