Type one: prescription computer glasses
These are single-vision lenses optimised for the distance between your eyes and a monitor — typically 50–70cm. This is a different focal distance from reading glasses (designed for 30–40cm) and from regular distance glasses. Wearing glasses optimised for the wrong distance forces your eyes to compensate.
Who they're actually for: people who wear glasses and are over roughly 35–40. From around this age, the lens of the eye loses flexibility — presbyopia begins. Maintaining focus at a fixed near distance requires increasing muscular effort. By your 40s, wearing reading glasses for screen work (or distance glasses, which are more common) means your eyes are compensating significantly for hours every day.
Prescription computer glasses, properly fitted by an optometrist, can remove most of that compensation effort. The evidence for this group is solid — studies consistently show reduced eye fatigue and headaches in presbyopic screen users wearing correctly prescribed computer glasses compared to wearing their regular glasses.
Verdict: Worth it if you're over 35–40, wear glasses, and spend significant time at screens. Get them from an optometrist rather than off-the-shelf — a proper prescription for your specific screen distance makes a real difference.
Type two: blue light blocking glasses
These filter blue-wavelength light from screens. The theory is that blue light is particularly straining to the eyes and disrupts sleep.
On eye strain specifically, the evidence is weak. The most comprehensive systematic review on the subject — a 2023 Cochrane Review — found no meaningful reduction in eye strain symptoms from blue light glasses compared to clear placebo glasses. The fundamental issue is that screens simply don't emit blue light at levels that cause measurable eye surface damage or discomfort beyond what any light source would cause.
On sleep, the picture is clearer. Blue light in the evening does suppress melatonin production and shift sleep onset time. Using blue light glasses or enabling Night Mode from early evening has real evidence behind it for improving sleep quality in people who use screens before bed.
Verdict: Unlikely to reduce daytime eye strain. The sleep benefit from evening use is real — but you can get it for free by enabling Night Mode on your devices.
What actually reduces eye strain
The most evidence-backed interventions for screen eye strain don't require any purchases:
Prescription computer glasses are a legitimate tool for people over 40 who wear glasses. For everyone else, the better investment is in habits and setup rather than eyewear.