Blue-light lenses became popular fast, largely on the claim that they prevent digital eye strain and protect long-term eye health from screen exposure. The honest picture is more limited than the marketing around it — and also not nothing.
What the research actually supports
The amount of blue light emitted by phones and laptops is a small fraction of what you get from a few minutes outdoors in daylight. There's no strong clinical evidence that screen-level blue light causes lasting retinal damage. If someone is selling blue-light lenses purely on "protects your eyes from screen damage," that claim is overstated.
Where it does help
Screens emit light directly at your eyes rather than reflecting it the way a printed page does, and a lot of people find that direct blue-heavy light contributes to a washed-out, glary feeling by the end of a long work day. A blue-light filter reduces that specific wavelength and, anecdotally, a meaningful number of our customers report less eye fatigue and better sleep after switching — likely tied to reduced blue-light exposure close to bedtime affecting melatonin, which does have research behind it.
Who it's actually worth it for
If you're on screens more than 6 hours a day, especially in the evening, the coating is a low-cost addition worth trying — it's not going to hurt anything and a fair number of people notice a real difference in comfort. If you're mostly outdoors or on screens briefly, it's not going to move the needle much, and the improvement from simply blinking more and taking real breaks (see: the 20-20-20 rule) will matter more.
Either way, if your actual symptom is dryness rather than glare, the coating won't fix that — that's a blinking and break-taking problem, not a filtering problem.