Eye care vision chart principle: It makes use of psychological principles of space perception, so that a 2-dimensional figure can be viewed as a 3-dimensional extension. Prolonged visual exposure to close objects causes visual fatigue. It is recommended to gaze at the chart for 25 seconds to relief visual fatigue.
Soft green desktop background color is recommended by ophthalmologist to effectively alleviate eye fatigue.
Three function :
Eye care vision chart
Vision care wallpaper album
Vision care testing: shortsighted, Color Blindness, color weakness tests