These visions form the basis of the witch trials that take place in the play. The girls, led by Abigail Williams, use their visions to accuse innocent people of witchcraft, leading to their arrests and eventual deaths.
The idea of visions is used by Miller to explore the themes of mass hysteria, fear, and moral corruption that drive the Salem witch trials. The visions serve as a symbol of the irrational and destructive forces that can overtake a society and ultimately lead to injustice and tragedy.