In The Wonderful Wizard of Oz, Dorothy and her friends wear spectacles to protect themselves from the blinding brightness of the Emerald City.
Dorothy and her friends must wear the spectacles given to them in The Wonderful Wizard of Oz because the brightness and glory of the Emerald City will blind them. In the story, the Emerald City is so radiant that it poses a risk to those who look upon it without protection, hence the necessity of wearing the spectacles.
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