noun
turned-in eyelashes; ingrown eyelashes; trichiasis
Refers to eyelashes that grow inward toward the eye, causing irritation. The medical term is trichiasis, but in everyday language it describes the condition of having lashes that turn in.
逆さまつげが目に当たって痛い。
My turned-in eyelashes are poking my eye and it hurts.
眼科で逆さまつげの治療を受けた。
I received treatment for ingrown eyelashes at the eye clinic.