The idea is to help children realize by themselves they are not seeing as clear as they could. To do so, we gave students a pair of glasses made of paper. Instead of graduated lenses, Paper Glasses have pinholes that use the stenopeic effect to improve visual acuity.The Stenopeic Effect is a physical optics effect that increases the depth of field. When allowing only a very narrow beam of light to enter the eye, there is no convergence, achieving clear vision at any distance.Paper Glasses works as a simple vision test to keep children in school.