How much time do you spend near the system?

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Most of the time I will be near system, in my office I work for 10 hours after coming home I nearly sit near my system for atleast 4 hours,so total of 14hours I sit near the system, sometimes I think will that effect our eyes, if so what precautions do we have to take ? Do you also spend much time near the system ,if so what areyou doing to take care of your eyes?