Blue-Light Glasses Need Calculator
Weigh your screen habits, evening exposure and eye-strain symptoms into a simple score for whether blue-light glasses are worth trying.
How it works
Score = screen-time points + evening-exposure points + symptom points + sleep-disruption points (0–8)
Blue-light glasses filter part of the short-wavelength light from screens. Evidence that they reduce eye strain is mixed — much digital eye strain comes from reduced blinking, glare and poor posture rather than blue light itself — but the case is stronger for people with heavy evening screen use, where blue light can suppress melatonin and delay sleep. This score simply weighs the factors most likely to make the glasses worthwhile so you can decide whether to try them.
Worked example
8 screen hours a day (2 points), 2 hours after sunset (2 points), mild symptoms (1 point) and no sleep trouble (0 points) total 5 of 8 — in the optional range, where better screen hygiene may help as much as glasses.
Frequently asked questions
Do blue-light glasses actually work?
Controlled studies show little consistent benefit for eye strain, but many users report comfort, and reducing evening blue light can modestly help sleep timing. They are low-risk to try, but they are not a substitute for breaks and good lighting.
What helps digital eye strain the most?
The 20-20-20 rule, blinking deliberately, reducing glare, increasing text size, and keeping the screen an arm’s length away and slightly below eye level tend to help more than any single accessory.
Should I use night mode instead?
Warm/night display modes and lowering brightness in the evening reduce blue light for free and can help sleep. They pair well with, or substitute for, blue-light glasses.
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Educational estimate only, not medical advice — talk to an eye doctor, dentist, dermatologist or other qualified professional about your own care.