Khomyakov noted that Russians spend on average six to seven hours a day at the computer. To mitigate the harm, you need to position the monitor screen directly in front of you. Make sure the top of the screen is level with your line of sight. The distance from the eyes to the monitor should be about 50-60 centimeters.
If we are talking about a laptop or tablet with a screen diagonal of 10-12 inches, then the distance can be equal to the length from the elbow to the thumb. This is an average of 40-45 centimeters.
In addition, you should properly organize the lighting in the room. It is necessary to choose light sources with a more natural radiation, the lamps should have zero ripple. The luminous flux that a 60-watt incandescent lamp emits is quite enough.