How does the Eye Strain Score Calculator work?

Blinking drops from approx 15/min normally to approx 5/min during screen use Then: Reduced blinking leads to a reduced tear film and dry, irritated eyes Then: 20-20-20 rule: every 20 minutes, look 20 feet away for 20 seconds.

Can you give an example of how to use the Eye Strain Score Calculator?

Example: Input 8hrs screen, 3 breaks, 60cm distance, moderate brightness gives a result of Moderate strain risk - increasing break frequency to every 30 min would help most.

Is the Eye Strain Score Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Eye Strain Score Calculator?

Our Eye Strain Score Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Eye Strain Score Calculator

Screen hours/day

Breaks (20-20-20 rule)

Screen brightness (%)

Screen distance (cm)

Digital eye strain affects up to 90% of people using screens 2+ hours daily. Symptoms include dry eyes, blurred vision, and headaches.

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Pro Tip

Use lubricating eye drops if working at screens for prolonged periods - dry office air combined with reduced blinking is a very common cause.

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Did You Know?

Contact lens wearers experience digital eye strain at twice the rate of glasses wearers.

References

›Computer vision syndrome — AOA
›20-20-20 rule — Healthline

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