use of spect for computer

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hello friends i am using computer four to five hours per day .i think this time is much more for my eyes iam taking other precaution while using it. yesterday luckily i find my sun glasses during cleaning my wrddrobe . so i am using it whenever i sit on computer. and its great. there is less stress on my eyes its good .ithink normal glasses is also useful. i dont have to close my eyes after every twenty minutes.