SAEDNEWS: Keeping an appropriate distance from a computer screen can improve viewing comfort and reduce eye strain during prolonged screen use.
According to SAEDNEWS, there is no single distance that suits every computer setup, but a practical starting point is to position the screen about 50–70 centimeters (20–28 inches) from the eyes. The exact distance can vary with screen size, resolution, and individual vision needs. The screen should be far enough away that you can read comfortably without leaning forward or squinting.
A comfortable setup involves more than measuring the distance between your face and the monitor. The screen should generally be positioned so that:
Your eyes are roughly level with the upper portion of the screen.
You can read text without moving your head closer to the display.
Your shoulders and neck remain relaxed.
The screen is directly in front of you rather than significantly off to one side.
If text appears too small at a comfortable distance, increasing the display's text or interface size is usually more useful than repeatedly moving closer to the screen.

Sitting very close to a screen for long periods can contribute to digital eye strain, which may involve symptoms such as tired eyes, dryness, blurred vision, headaches, or difficulty focusing. These symptoms are often influenced by several factors, including prolonged near work, reduced blinking, glare, and poor viewing conditions—not simply screen distance.
A useful approach is to combine a comfortable viewing distance with regular breaks. The 20-20-20 approach is commonly suggested for screen-related eye comfort: after about 20 minutes of near viewing, look at something around 20 feet away for about 20 seconds.
If you regularly find yourself leaning toward the monitor, squinting, or increasing your viewing distance because the screen feels uncomfortable, check the font size, brightness, glare, and your vision correction as well as the physical position of the screen. People with particular vision needs may require a different setup.
For everyday computer use, around 50–70 cm (20–28 inches) is a useful general range, but comfort and clear vision should guide the final adjustment.