This is the 286th most frequent Japanese word.
見え
"見え" (mie) means "appearance" or "visibility."
Here, '見えます' is used to express the ability to visually perceive something (the mountain).
山が遠くに見えます。
I can see the mountain in the distance.
In this case, '見えた' indicates the ability to discern or perceive an emotional state based on visual cues.
彼の表情から喜びが見えた。
I could see joy on his face.
Here, '見えなくなった' is used to describe the inability to visually perceive clearly due to poor vision.