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In this age of computer + Internet, many of our jobs are computer dependent, even require us to sit in front of computer for a long time. As we all know, computer does a lot of harm to our health in many ways. One of them is that the large amount of harmful blue light emitted from display can damage our retina, thus leading to maculopathy and cataract, causing asthenopia (eye strain), and leading to poor sleep quality and even insomnia.