The discovery and test actually came from Singapopre and they ended up making some glass classrooms. Pictures here - https://www.cnn.com/2015/04/05/asia/myopia-

The discovery and test actually came from Singapopre and they ended up making some glass classrooms. Pictures here - https://www.cnn.com/2015/04/05/asia/myopia-east-asia/index.html https://www.cnn.com/2015/04/05/asia/myopia-east-asia/index.h... Perhaps it is roof opening...