Her eye had been hiding a secret. 👁️ That ingrown eyelash — called trichiasis — had been growing in the wrong direction the entire time, curling back into the eyelid instead of outward like it was supposed to. And every time she blinked, it was dragging across one of the most sensitive surfaces in the human body. Your cornea has more nerve endings per square millimeter than almost anywhere else on your body. An ingrown lash sitting against it is basically nature's most annoying torture device.