Monitor Distance From Your Eyes and How to Measure It

By mid afternoon your eyes feel dry, you catch yourself leaning toward the screen, and your neck aches from a posture you never chose. Very often the cause is not the monitor itself but where it sits: a few centimetres too close, or far enough away that you creep forward to read.

Getting monitor distance right is one of the cheapest ergonomic fixes there is. You need a tape measure and ten minutes. This guide gives you a starting distance based on screen size, a simple test to fine tune it, and the adjustments to make when your desk is too shallow to follow the usual advice.

The usual monitor distance rule and where it comes from

Most office ergonomics guides recommend placing a monitor roughly an arm's length away, which works out to about 50 to 75 cm for most adults. That range comes from occupational health guidance that balances two things: the eye's focusing effort, which drops as distance increases, and readability, which drops as text gets smaller in your field of view.

At closer distances, your eyes work harder to focus and to converge, turning slightly inward. That sustained effort is one contributor to the tired, gritty feeling of digital eye strain. Further away, the muscles relax, but only if you can still read comfortably without leaning in.

Arm's length is a reasonable start. It just ignores the fact that monitors now range from 24 inch office screens to 34 inch ultrawides and 27 inch 4K panels with very small text.

Monitor distance by screen size

Use this table as your starting point. Measure from your eyes to the centre of the screen, sitting in your normal working position.

A useful rule of thumb: the full width of the screen should fit within your view without turning your head. If you need to rotate your neck to read the edges of a 34 inch ultrawide, it is too close.

How to measure and fine tune your distance

Tables give you a range. Your eyes decide the exact number. Try this test.

1. Sit fully back in your chair with your feet flat and shoulders against the backrest.
2. Open a normal document or webpage at your usual zoom level.
3. Push the monitor back until body text becomes slightly hard to read, then bring it forward until reading feels effortless again.
4. Measure that point from your eyes to the screen centre and write it down.
5. Work at that distance for two full days before changing anything.

If your comfortable point is closer than 50 cm, the fix is usually larger text, not a closer screen. Increase operating system scaling by one step, for example from 100 to 125 percent, and repeat the test.

Do not forget height

Distance and height work together. Moving a screen back changes the angle you look at it, so recheck height after any change. We go into this in why monitor height is not what most guides claim.

Why closer is sometimes better

A lot of advice treats more distance as always healthier. I disagree for one large group of people: anyone who wears progressive lenses or reading glasses.

Progressives have a narrow intermediate zone tuned for roughly 50 to 80 cm, depending on the prescription. Push the screen beyond that zone and the wearer tilts their head back to find a sharp area of the lens, which loads the neck far more than a slightly closer monitor would. For these users, a distance of 55 cm with a lower screen often beats 80 cm by a long way.

Similarly, if you work with detailed spreadsheets or code all day, a slightly closer screen with comfortable text size can mean less squinting than a far one at default scaling. The goal is relaxed reading, not hitting a number. If you wear glasses, see our guide on how to place a monitor when you wear glasses.

Fixing monitor distance on a shallow desk

Many home desks are only 60 cm deep. Put the monitor stand at the back, sit at the front edge, and you might have 55 cm at best for a 27 inch screen. A few options help:

• A monitor arm: clamping to the back edge lets the screen sit over the rear lip, gaining 10 to 15 cm, and most arms also let you fine tune the distance by a few centimetres without moving the desk.
• Moving your chair back: if you use a keyboard tray or a laptop as your keyboard, you can sit further away without losing reach.
• A smaller screen at higher scaling: a 24 inch 1440p monitor at 125 percent can be very comfortable at 55 cm.
• Pulling the desk off the wall: even 10 cm of gap gives an arm room to push the screen back.

Distance for two monitors

With two screens, place the one you use most directly in front of you at your measured distance. Angle the second inward at 20 to 30 degrees so its centre is roughly the same distance from your eyes. If you use both equally, centre the join between them on your nose and angle both slightly inward, like an open book.

Laptops are the awkward case. Used on their own, they force you to choose between a comfortable typing position and a comfortable viewing distance, because the screen and keyboard are joined. If you use a laptop as a second screen, raise it on a stand to roughly the height of the main monitor and push it back to match its distance, then use an external keyboard so your arms are not stretched forward.

The secondary screen can sit a little further away if you only glance at it, such as for chat or reference material. Just keep its text size large enough that you do not lean toward it.

Frequently asked questions

How far should a 27 inch monitor be from your eyes?

For a 27 inch 1440p monitor, start at 65 to 75 cm. Use the reading test to fine tune it, and increase text scaling rather than moving closer if text feels small. A 27 inch 4K screen at 150 percent scaling can sit a little closer.

Is sitting too close to a monitor bad for your eyes?

Sitting very close makes your eyes work harder to focus and converge, which can add to eye strain and dryness. It is not known to cause permanent damage in adults. Moving back and taking short breaks usually relieves the symptoms.

How do I know if my monitor is too far away?

The clearest sign is leaning forward to read without realising it. Squinting at body text or zooming in often are other signs. Bring the screen closer or increase the text size until you can read comfortably while sitting back.