Implementations relate to systems and methods for detection and management of viewing conditions. One or more sensor devices can be provided for a user to monitor, manage, and adjust viewing conditions to promote the health and the user's health and vision. The sensor device(s) can include a distance detection device, and others. The sensor device(s) can be or include one or more detachable devices which can be attached or affixed to eyeglasses or other wearable articles. Viewing conditions such as viewing an object or source for too long and/or at too close a distance can trigger various responses, such as a vibrating or other signal to break the concentration of focus to refresh the eyes. The sensor device(s) can also or instead be configured with user profiles to regulate the type or nature of content the user is viewing, for example to restrict television viewing by children using parental controls.