Do blue light glasses work?
What clinical reviews and eye-care organizations say about blue-light filtering lenses for screen eye strain and sleep.
Eye-health guides
Plain-English answers to common questions about eyesight, each based on public-health and eye-care sources that are listed at the end of every guide.
Not medical advice. These guides are general information. For any concern about your eyes or vision, see an optometrist or ophthalmologist.
Vision problems are common. The World Health Organization reports that at least 2.2 billion people worldwide have a near or distance vision impairment, and that in at least 1 billion of these cases the impairment could have been prevented or has yet to be addressed.[1] Many of these problems are found and treated through regular eye exams.
All guides
Can you improve your eyesight naturally?
Eye exercises, carrots and other popular ideas, checked against what eye-health organizations say.
AREDS2 eye vitamins: who are they for?
Who the AREDS2 supplement formula was studied in, and what to ask your eye doctor before taking it.
Does the 20-20-20 rule help eye strain?
What the 20-20-20 rule is, how it fits with other screen habits, and how strong the evidence is.
How often should you get an eye exam?
Exam timing by age from two US eye-care organizations, side by side, and why they differ.
Myopia in children
Why nearsightedness often starts in childhood, and the approaches eye doctors discuss for slowing it.
Presbyopia: why reading gets harder with age
Why close-up focus changes in midlife, and the ways it can be corrected.
Nearsighted vs farsighted
The difference between myopia and hyperopia, and what minus and plus numbers on a prescription mean.
Sources
- World Health Organization. “Blindness and vision impairment” (fact sheet). https://www.who.int/news-room/fact-sheets/detail/blindness-and-visual-impairment. Accessed 2026-11-05.
How we choose sources and keep guides up to date: editorial policy.