眼 (yǎn): eye; measure word for wells, eyes

My grandmother is getting old, and her eyes aren't very good anymore. She has to put on reading glasses when she reads the newspaper.

Hearing the good news, she was so happy that tears glistened in her eyes, and for a long while she couldn't say a word.

While climbing the mountain, a gust of wind blew sand into my eye. It hurt so much that I quickly closed my eyes.

He saw with his own eyes a thief entering the neighbor's house, so he immediately called the police.