And it should not forget its important role for people with disabilities, those who do not have the opportunity to interact directly with the world.With all of us, the Internet opens the way to the cultures, different history, providing tremendous opportunities for education, a source of immense knowledge without a public library can match. And the the first and the last, the computer has become a tool that works extremely effectively, efficiently serve us, it replaces antiquated typewriter, replacing notebooks and pen for us the modern tools, making the work becomes more convenient and a lot simpler.The negative effects of the computer to human life : The main factors that cause harm to the health of people who work with computers: sitting postures in a long time; electromagnetic radiation of computer screen; eye strain; overloading of joints; dependence on the computer.Sitting posture: it seems we sit comfortably the side of his computer, but in fact it is again forced posture and not good for the body: neck, head, arms and shoulder muscles being stretched, from there leads to overloaded for the backbone, the degeneration of articular cartilage with adults and children with spine .Electromagnetic radiation: modern computer screen has been designed with the protective layer to reduce the harmful effects of this, but of course only be reduced, not eliminated.Visual impact: our eyes are constantly reacting to the changes on the screen of text or pictures, cause the eyestrain and degrading the sharpness of sight. The choice of color, words, the components of the program window is also unreasonable damage to the eye. To protect the eyes, we should adhere to the following principles when working with your computer:-The distance from the eyes to the screen 50-70 cm;-Should not work with computers in the dark;-Children up to the age of the school should just sit behind your computer constantly not more than 10-20 minutes, then needed a break and relax the eyes. If there are problems of vision, need to wear glasses when working with computers.Overloading the joints of the hand: nerves of the affected fingers constantly when I type keyboard, leading to numb, weak. This can cause harm to joints and ligaments of the hand, and if continued could lead to chronic hand pain.
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