Doctor Khomyakov: the distance from the eyes to the monitor must be at least 50-60 centimeters 
Moscow “Sergei Khomyakov named the safe distance at which you should keep your eyes from the computer monitor. In order not to spoil your eyesight, you should be 50-60 centimeters from the screen, the doctor of medical sciences told RIA Novosti.
The physician noted that the monitor should be positioned directly in front of you, while its upper edge should be at the level of the line of sight. Khomyakov recommended holding 50-60 centimeters, but the distance may vary depending on the diagonal of the device. “If you are working with a laptop or tablet with a screen diagonal of 10-12 inches, then the distance may be equal to Harmon's distance – this is the distance from the elbow to the thumb, or on average 40-45 centimeters,” the specialist explained.
In addition, it is important to pay attention to the lighting level of the space for working at the computer. According to Khomyakov, the most ergonomic light sources are those that are as close as possible in the spectrum of emitted light to the luminous flux of the natural spectrum. He added that it is better to choose lamps with zero pulsation, because when they are illuminated, the eyes are the least tired.
If we talk about artificial light sources, induction lamps, as well as incandescent lamps and some modern LED lamps meet these criteria. …
For screen readers, the ophthalmologist recommended paying attention to the background. “The optimal background of a sheet of paper should be yellowish, have contrasting black letters with special” notches “,” – said the physician. In addition, according to him, much depends on the time of day and the state of the optical media. So, in the evening it is recommended to read in a “warm” light.
Earlier, ophthalmologist Dmitry Dementyev listed drugs that are dangerous for eyesight. The specialist said that many of the symptoms that patients complain about, for example, dry eyes or double vision, are not directly related to the eye disease, but may be related to taking medications.