마술 반지(MagicCircle)
It is an interesting app named MagicCircle,you can change the shape of the circle and the thickness of the edge.Then, there will appear beautiful and colorful circles when you touch the screen or move on the screen.It may be good for color blindness and color weakness.There is no doubt that playing this app often will do good to both childs and adults vision.It will also benefit babys vision.