You move your eyes down. Then you make them go around. And then you look from left to right. That's what our eyes can do. Cut the plastic off a beverage six pack into pairs of glasses.
Children use pipe cleaners on the sides to hold the glasses on their heads.
Set up an optometrist office. Provide eye charts, glasses made in art, white T-shirts, a telephone, chairs, notepads, pencils, magazines, small pen lights etc. Provide Braille books for the children to study. Perhaps you might want to put out books that children can listen to on tape about the hearing impaired. Discuss how it feels to lose a tooth.