Guides
Guides
Eight articles covering the buying decision, the eye-health basics, and the evidence underneath both. Every factual claim links to its source, and where the evidence is thin we say so rather than filling the gap with confidence.
Last reviewed August 2026. We update a page when the underlying evidence changes, not on a schedule.
Just want a recommendation?
The guides below are for readers who want the reasoning. If you would rather skip to the answer, our picks for every kind of buyer name one pair for each reason people buy.
All guides
Evidence · 9 min read
Do blue light glasses work? What 17 randomised trials found
The Cochrane review pooled every usable trial and came back with an uncomfortable answer for the industry. Here is what it measured, what it could not measure, and what that means for you.
Evidence · 10 min read
Do blue light glasses help you sleep?
Evening light genuinely shifts your body clock. Whether a pair of amber glasses does enough to change your sleep is a different question, and the trials are small.
Evidence · 8 min read
How do blue light glasses work?
Coating versus embedded tint, what a "blocks 90% of blue light" claim can legitimately mean, and why two lenses with the same number can behave completely differently.
Eye health · 9 min read
Digital eye strain: what reduces it, in order of evidence
The symptoms are real. The causes are mostly behavioural and optical. Here are the interventions professional bodies actually recommend, cheapest and best-supported first.
Buying · 11 min read
How to choose blue light glasses
Four steps in the order that matters: name your reason, sort the prescription, ignore the filtering percentage, judge the frame. Plus the claims that should make you close the tab.
Buying · 8 min read
Prescription blue light glasses: when you need them
An uncorrected prescription causes the symptoms people blame on blue light. Working out which situation you are in is the highest-value decision on this site.
Buying · 8 min read
Fit before style: getting frame measurements right
The numbers printed inside the temple arm tell you more about whether a frame will suit you than any face-shape chart. Here is how to read them.
Eye health · 5 min read
Caring for coated lenses without ruining them
Most lens damage is self-inflicted: dry wiping, shirt hems, hot water, alcohol wipes. A short, practical routine that keeps coatings intact.