Automatic display zoom for people suffering from Presbyopia

Abstract

Human eyes have an adjustment function to adjust for different distances of seeing. However, it becomes weaker as you get older. When you move paper closer to read small letters, it is not in focus. When you move it away to bring it into focus, it is too small to read. This condition is called Presbyopia. People suffering from presbyopia also suffer from this condition when they use a smartphone or tablet. Although they can magnify the display using the pinch operation, it is a bother. A method for automatic display zoom, to see detail and an overview, was proposed in [Satake et al. 2016]. This method measures the distance between a face and a screen to judge whether you want to see detail or an overview. When you move it close to your face, it judges you want to see detail and zooms in. When you move it away from your face, it judges that you want to see overview and zooms out. In this paper, we improve and apply this method for presbyopia. First we observe and analyze the behavior of presbyopic people when trying to read small letters. Then we propose a suitable zooming function, for example, a screen is zoomed in also when it is moved away if the person suffers from presbyopia.