Here are examples of the word/phrase "seen" used in a sentence and paraphrased in a sentence...
The stars can be seen during some nights.
The stars can be optically discerned during some nights.
Clouds can be seen more clearly on sunny days.
Clouds can be visually perceived more clearly on sunny days.
I have seen her many times at that park.
I have visually perceived her several times at that park.
Other Examples...