expression, godan verb (-ku)
open one's eyes
Literal physical action of opening the eyelids. Can also be used metaphorically in contexts where someone becomes aware of something, but the core sense is physical.
朝、目を開くとすぐに時計を見た。
When I opened my eyes in the morning, I immediately looked at the clock.
赤ちゃんがゆっくり目を開いた。
The baby slowly opened its eyes.
expression, godan verb (-ku)
open one's eyes to the truth; awaken to; discover
Idiomatic use: to become aware of a new reality, truth, or way of thinking. Often implies a transformative realization.
彼の言葉で私は真実に目を開いた。
His words opened my eyes to the truth.
留学して、世界の広さに目を開いた。
Studying abroad opened my eyes to the vastness of the world.