Quick answer: Screen eye strain is mostly caused by focusing too close, glare, or sitting still for too long. The fix involves keeping your screen 50-70 cm away, using the 20-20-20 rule, matching screen brightness to your room, and reducing glare. If symptoms persist, see an eye doctor.
Why Your Eyes Feel Tired by Evening
When you stare at a computer screen, your eyes constantly focus on a near point. This forces your eye muscles to work harder than when looking at distant objects. Additionally, staring at screens reduces how often you blink, leading to dryness and irritation. Glare from windows or overhead lights also forces your eyes to work harder to distinguish images on the screen.
Screen Distance and Height: The Core of Eye Protection
The recommended distance is 50-70 cm from your eyes to the screen. If the screen is too close, you’ll likely lean forward (Forward Head Posture), straining both your neck and eyes. If it’s too far, you might squint to read small text. Adjusting the height so the top edge of the screen is at or slightly below eye level helps your eyelids close slightly while looking down, which reduces tear evaporation and dryness.
The 20-20-20 Rule and Light Management
- 20-20-20 Rule: Every 20 minutes, look at an object 20 feet (about 6 meters) away for 20 seconds to relax your eye muscles.
- Brightness: Match your screen brightness to your room’s ambient light. It shouldn’t be so bright it glares, nor so dim you have to squint.
- Reduce Glare: Position your screen perpendicular to windows to minimize direct glare entering your eyes.
- Text Size: Increase your font size instead of leaning in to read.
Why a Monitor Arm Helps Your Eyes
Standard monitor stands often have limited distance adjustment, forcing you to stiffen your neck or lean forward to find a comfortable focus point. The ERGONOZ Core Single Monitor Arm at ฿1,290 allows you to freely adjust height, angle, and distance for monitors sized 17"-32" weighing 2-9 kg. Keeping your screen at a comfortable eye distance without moving your body reduces neck pain and makes it easier to follow the 20-20-20 rule, as you won’t need to constantly shift positions to reduce fatigue.
Comparison: Fixed Stand vs. Adjustable Arm
| Feature | Fixed Stand | Adjustable Arm |
|---|---|---|
| Distance from Eyes | Fixed or limited adjustment | Freely pull in/out (easy to maintain 50-70 cm) |
| Screen Height | Often too high for eye level | Adjustable to sit exactly at eye level |
| Eye Impact | Requires squinting or neck strain if misaligned | Reduces strain because the screen comes to your eyes |
Frequently asked questions
What is the 20-20-20 rule?
It’s an eye rest technique: every 20 minutes, look at something 20 feet away for 20 seconds. This helps reduce eye muscle fatigue from staring at close screens for too long.
Do blue light modes actually help?
They filter blue light and reduce glare but don’t solve the core issues of distance and focusing. Use them alongside proper brightness adjustment and regular eye breaks.
How bright should my screen be?
It should match your room’s ambient light. If the screen is much brighter than the room, it glares; if darker, you strain. Use a white piece of paper next to the screen as a brightness reference.
Is daily evening eye irritation normal?
If it happens daily even after resting your eyes, it could signal Dry Eye or hidden vision issues. Consult an eye doctor for an exam and proper treatment.
The bottom line
Adjusting your screen to the correct distance and angle significantly reduces eye burden. An adjustable monitor arm makes positioning easy and keeps you comfortable longer. Orders over ฿800 ship free in Thailand. See more at the Monitor Arms collection.
About ERGONOZ — a Thai ergonomics brand designing monitor arms, standing desks, and ergonomic chairs for the way you actually work. Read the brand story at ergonoz.com.