Nearsightedness is on the rise around the globe, especially among children. If current trends continue, half of the world’s population will be nearsighted by 2050, according to a report from the Brien Holden Vision Institute in Australia. Although the drivers of this worrisome trend aren’t entirely clear, specialized eyeglass lenses have been shown to keep myopia from getting worse. This is particularly important for children and teens who often experience progression in the condition as their bodies grow. Researchers from the ZEISS Vision Science Lab at the University of Tübingen, in Germany, and the University of Murcia, in Spain, describe their new instruments, which measure lens performance under real-world viewing conditions.