Who blinds Ferdinand so he can't move in the tempest?

In Shakespeare's play "The Tempest," Ferdinand is blinded by the enchantment of the island and the magic of Prospero, who creates illusions to test Ferdinand's character. Prospero uses his magical powers to manipulate events, making it seem as though Ferdinand is unable to move freely. Ultimately, this is part of a larger scheme to bring Ferdinand and Miranda together while ensuring Ferdinand proves his worthiness.