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What presented here is a kind of protection method of vision. When the camera finds the distance between you (face) and electronic screen distance too close, the screen will show the fuzzy display effect. The screen will have a clear display effect only if you (face) and electronic screen keep healthy distance. Now more and more people use mobile phones, ebook, computer and other electronic products, but it is easy to make the eyes fatigue for facing the electronic screen for a long time. Then people tend to get more and more closed to the electronic screen in order to get clear image, which makes the visually impaired quickly.