Living in a digital world means that children experience more and more screen time. As a result, there is a strong increase in myopia among young children. In Asia, almost 80% of youngsters have myopia and in the Netherlands this is already 56%. This leads to serious health problems later in life, such as poor vision and blindness. In addition, it brings major social problems and high social costs, such as learning disabilities and loss of productivity. To counter this, a lifestyle intervention is necessary: children need to go outside more, because sufficient outdoor light is essential for the development of the eye. In addition, parents need to be more aware of the guidelines regarding screen time. We want to achieve this by offering an additional service in line with the 20-20-2 rule of ‘Het Oogfonds’, in which (primary school) children are challenged to go outside more using a wristband with a GPS tracker.