Myopia

Holding smartphones at close distances could place increased demands on the eye's ability to correct for distance (accommodation) and coordination between eyes (vergence), compared to the distances typically used for reading printed text. Over time, this could lead to symptoms such as eyestrain and headaches.

For children and teenagers it is even worse: Holding smart phones at close distances can dramatically accelerates the process of getting an irreverible short-sightedness (myopia), because the growth of the eye-balls adopts to short viewing distances.

visionguard trains the user to keep a better viewing distance. After 5 distance warnings it displays a timeout window that stays for 10 seconds and blocks any interactions with the smartphone.

Please note:

visionguard uses your front camera to measure the distance between your eyes and the screen.

visionguard uses battery saving mechanisms, for instance, it sleeps while your smart device is sleeping. Power consumption should be similar to Bluetooth power consumption (according to the Android Energy monitor).

As visionguard uses a background service you can close the app and come back whenever you want to switch the service on and off.