Visions or foreseen events can’t be accurate unless they happened exactly as seen by the soothsayers.

This is the reason why I always tell people who claim they have seen visions, “to be responsible” in disseminating whatever details or information they’ve seen such events.

How these visions can be seen by seers?

Most people could see them in dreams, though what have seen in dreams are not (all the time) literally correct (accurate), because in dreams, most interpretations are symbolic.