To have good eyesight; being able to see clearly, including distant or small objects.
祖母は目がいいので小さな字でも読むのが速い。
My grandmother has good eyesight, so she reads small print quickly.
彼は目がいいから遠くの鳥の種類がすぐわかる。
He has good eyesight, so he can immediately identify birds far away.
目がいい人は細かい違いに気づきやすい。
People with good eyesight tend to notice small differences easily.