How far should my monitor be from my eyes?

OSHA's computer workstations eTool specifies 20 to 40 inches from the eye to the front surface of the screen, with the top of the screen at or slightly below eye level and the center of the monitor 15 to 20 degrees below horizontal eye level.

Do blue light glasses help with eye strain?

A Cochrane review of 17 randomized trials covering 619 participants found that blue-light filtering lenses may not reduce eye strain symptoms from computer use over short-term follow-up, and found probably little or no effect on visual acuity. There was no randomized evidence at all on several other commonly marketed benefits.

Is the 20-20-20 rule proven?

Not experimentally. Its creator, Dr. Jeffrey Anshel, has written that no peer-reviewed studies have validated it, and the numbers were adapted from carpal tunnel break research rather than derived from vision studies. It is endorsed by major eye care bodies, it is harmless and free, and the underlying principle of frequent short breaks from near work is sound. Treat the specific numbers as convention.

Do computer screens damage your eyes?

The American Academy of Ophthalmology states there is no scientific evidence that light from computer screens damages the eyes. Digital eye strain is real and worth addressing, but it is a symptom problem rather than structural damage.

Why do my eyes get dry when I concentrate?

Screen work reduces both blink rate and blink completeness, and cognitive load suppresses blinking independently. Normal blink rate is 15 to 20 per minute. Incomplete blinks fail to resurface the tear film over the lower cornea, which produces the burning and gritty sensation.

Safety & Ergonomics · October 04, 2026

Office Ergonomics: Eye Strain, Workstation Setup, and What Actually Helps

Two of the most widely sold solutions for screen fatigue have little or no evidence behind them. The things that do work are free.

Administrative work does not look hazardous, which is exactly why nobody sets it up properly.

Between 60 and 65 percent of Americans report symptoms of digital eye strain. Among people using two or more devices simultaneously, the reported prevalence rises to around 75 percent. Contact lens wearers report it more than non-wearers, 65 percent against 50.

It is real, it is common, and most of what gets sold to fix it does not work.

The workstation numbers, from OSHA

Not opinions. These are OSHA's published figures from its computer workstations eTool.

Your body

"Hands, wrists, and forearms are straight, in-line and roughly parallel to the floor."
Head "level, forward facing, and balanced," generally in line with the torso.
"Shoulders are relaxed and upper arms hang normally at the side of the body. Elbows stay in close to the body and are bent between 90 and 120 degrees."
"Feet are fully supported by the floor or a footrest." Thighs and hips supported, generally parallel to the floor. "Knees are about the same height as the hips with the feet slightly forward."
Back fully supported with lumbar support, sitting vertical or leaning back slightly.

Your monitor

Viewing distance: 20 to 40 inches from your eye to the front of the screen. Most people sit too close.
Top of the screen at or slightly below eye level. The center of the monitor should normally sit 15 to 20 degrees below horizontal eye level.
Downward viewing angle should never exceed 60 degrees.
Tilt the screen perpendicular to your line of sight, typically no more than 10 to 20 degrees.
Place the monitor perpendicular to windows, not facing or backing them, to control glare.

That downward gaze angle is doing more than you think. Looking slightly down narrows the eyelid opening, which reduces evaporation from the tear film. It is not just a neck comfort rule; it is a dry eye intervention.

Why your eyes actually hurt

Normal spontaneous blink rate is 15 to 20 blinks per minute. Screen work reduces both the rate and the completeness of blinks. An incomplete blink fails to resurface the tear film over the lower part of the cornea, which is where the burning, grittiness, and dryness come from.

Cognitive load suppresses blinking independently. This is why a difficult spreadsheet dries your eyes out more than casual browsing does. You are not imagining that.

Symptoms group into four buckets: visual (blurring, slow focus change), internal ocular (ache, strain), external ocular (burning, dryness, grittiness, tearing), and extraocular (neck and shoulder pain, headache).

Two popular fixes that do not hold up

Blue-light filtering glasses

A Cochrane review examined 17 randomized trials covering 619 participants. Conclusion: blue-light filtering lenses "may not attenuate symptoms of eye strain with computer use, over a short-term follow-up period." Probably little or no effect on visual acuity, at moderate certainty. Sleep effects indeterminate at very low certainty. And there was no randomized evidence at all on contrast sensitivity, color discrimination, glare discomfort, macular health, or melatonin.

That is a lot of marketing built on very little.

The idea that screens damage your eyes

The American Academy of Ophthalmology states directly: "There is no scientific evidence that the light coming from computer screens is damaging to the eyes," and it does not recommend special eyewear for computer use.

Both halves of that matter. Digital eye strain is real, symptomatic, and worth fixing. It is not structural damage, and you are not going to ruin your eyes with a spreadsheet.

And one that is a good habit with an honest caveat

The 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds.

Here is where it came from. Dr. Jeffrey Anshel created it around 1998 in response to media requests for a simple message. The numbers were borrowed from carpal tunnel research, not vision research: he had encountered a study finding that shorter, more frequent breaks from computer use beat one long break every two hours, and he adapted the principle.

Anshel himself has written: "Despite the popularity of The Rule, no peer-reviewed studies to date have validated, let alone evaluated this technique." He also notes it does not stop or reverse myopia progression.

So do it anyway. It is endorsed by the American Optometric Association and the American Academy of Ophthalmology, it costs nothing, it is harmless, and the mechanism is sound: relaxing accommodation, restoring blink rate, interrupting sustained near work. Just know that the specific numbers are a convention, not a finding, and do not let anyone sell you a product based on it.

What actually helps

Move the monitor back to 20 to 40 inches and down so the center sits 15 to 20 degrees below eye level.
Kill the glare. Monitor perpendicular to windows. Reduce ambient light for screen work rather than adding more.
Blink deliberately and completely, especially during concentrated work. Lubricating drops help the dryness component.
Take short breaks from near work. Whatever interval you keep.
Get your refraction checked for the intermediate distance specifically. This one is underrated: people in standard progressive lenses often tilt the chin up to find the reading segment, which produces neck pain that gets blamed on monitor height. The monitor is not the problem; the lens is.
Humidify a dry room if dryness is your main symptom.

On sitting, standing, and micro-breaks

Micro-breaks have real evidence for a specific outcome. A meta-analysis of 22 samples covering 2,335 people found a small but statistically significant increase in vigor and reduction in fatigue. Effects on performance overall were not statistically significant, though clerical and creative tasks did show gains.

Honest summary: short breaks reliably help you feel less depleted. The productivity claim is weaker and task-dependent. Break durations studied ranged from 8 seconds to 10 minutes, with longer breaks performing better, and roughly 10 minutes giving the best effect in that dataset.

For sit-stand desks, the reasonable position is that alternating posture relieves the discomfort of sustained sitting, which is worth something. Claims beyond that get ahead of the evidence. Standing all day is its own problem, not a solution.

This is general safety information, not medical advice. If you have pain, numbness, or an injury, tell your supervisor and see a clinician. If you are hurt on an assignment, report it to Advance Staffing the same day at (901) 443-5589.

For employers placing administrative staff

Workstation setup takes about ten minutes per person and costs nothing but the time. A monitor riser is under twenty dollars. A footrest for someone whose feet do not reach the floor is less.

When we place administrative and clerical staff, the conversation about what the workstation looks like is worth having before day one, particularly for anyone working a full shift at a screen. Tell us about the role and we will screen for the systems fluency it needs and flag the setup questions that matter.

Sources

Talk to a person about it

Employers, call us with the order. Job seekers, apply once and we will match you as orders come in.

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