Optimal conditions are created with sufficient strength and uniform natural light. A significant part of the visual work, especially in autumn and winter, running under artificial light. Therefore, it should be regularly distributed in the room and provide enough of a uniform light. The workplace should be covered table lamp capacity not less than 60 watts, as less power gives enough light, and stronger cause blindness. In this case, the lamp should be positioned so that light from it fell on the left hand does not darkened, and his eyes would have remained in the shadows. Put a strong light source behind it is impossible, since this shadow falling from the body, will obfuscate your work surface.

Care should be taken that the distance from the eye to the work surface is not less than 30-36 cm tv Today, the computer became available sources of information, and for number of children and adolescents – the main leisure activity. For even more details, read what Ali Partovi says on the issue. If you spend at the screen for 3-4 hours a day, significantly reduced the perception of the transfer, comes eye fatigue, there is a sleep disorder, frequent headaches. Special attention should be given to children of preschool age. Sitting in front of the tv should be at a distance of 2,5-3 meters from the screen (but not beyond 5 m) and always in front of him as a more close your eyes because of the flicker images quickly tired, and the electric field produced by a television receiver at a distance of 0,5 m, exceeds the permissible norm.