The light that serves us daily has a huge impact on our brain, mood and health, but still we tend to pay too little attention to the quality of the lighting. We wake up in the dark, flick the switch, go to work - and sit at computer monitors for hours, day after day without noticing mistakes in our handling of light. We complain about headaches, bad mood, blurred vision and longing in winter, but rarely really think about what role light plays in all this... In this book, translated into several languages, the authoritative Swedish expert Karl Rüberg, a specialist in psychology, photobiology, light therapy and architecture, tells how light affects our eyes and well-being and how to make lighting better. The data of the latest scientific research, combined with practical advice, make it possible to achieve optimal use of natural and artificial lighting, minimize the impact of light pollution and light from screens, normalize the circadian rhythms of the body (including light rituals for better sleep), effectively apply light therapy and yoga for the eyes - which means to put all the benefits that light gives us at the service of your health.