Advance of technology information, software and electronic have increased the using of visual display terminals (VDT) widely especially at working time or unoccupied time. Using VDT too frequent often appears eyes exhaustion complaint tendency that be named: asthenopia.

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Free Radicals
Free radicals are molecules or atoms which contain single electron outside its orbit. Be found many kind free radicals those source from pollution, cigarette smokes, ultraviolet ray, greasy food, and others continuously 24 hours everyday go into body to cause oxidation process and disturb the human cells structure (stress oxidative).

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