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Lazy eye (amblyopia): the signs, the check between 3 and 5, the causes, and treatment with glasses, a patch or eye drops
For a parent or anyone looking after a child who squints, shuts one eye, tilts their head to see, or has an eye that drifts in or out; for a child who is 3 to 5 or has never had their vision checked; for a family just told a child has amblyopia, with a patch or drops to manage; and for adults who have had a lazy eye since childhood. The National Eye Institute (NEI, part of the NIH) says amblyopia is the most common cause of vision loss in kids, up to 3 out of 100 children have it, and early treatment works well. This page passes on, by name, what NEI says: the signs, which children are more likely to have it, the causes, the check, and treatment. It builds the words to say to the doctor, and prints a card to keep.
Right now
- A sudden change in sight, eye pain, an eye that suddenly starts to turn, or new double vision? That is not something to wait on, in a child or an adult: go to an eye doctor or an emergency room now, and call 911 in an emergency. A hurt eye: the eye injury page (ours).
- Can’t afford an eye exam or glasses? The eye care page lists free and low-cost programs (ours).
- Thoughts of suicide? Call or text 988, any hour (ours).
More help
- Linked to it, on this site: Eyes and sight: find the right page · Eye care you can afford · Refractive errors · Cataracts · Low vision · An eye injury.
- Care and costs: When you need a doctor and can’t pay · Get ready for your appointment.
- In a crisis: Help right now (988, 911). All our free tools.
Your eyes or your sight, and not sure this is the right page? The pages on this site for a hurt or pink eye, glaucoma, cataracts, diabetes and the eyes, macular degeneration, a detached retina, dry eye, fading sight and eye care you can afford, on one list.
This page and its wording were written with AI (Claude) for Scarlet Beast (our AI policy). No doctor or nurse has reviewed it. The facts were read on October 16, 2026 on one National Eye Institute (NIH) page: Amblyopia (Lazy Eye) (last updated November 26, 2024). NEI has no page of its own on strabismus today, so strabismus appears here only as that page describes it, as one cause. Ours: that a sudden change in sight, eye pain, an eye that suddenly starts to turn, or new double vision is not something to wait on, and 911 in an emergency; the eye injury page; 988 for thoughts of suicide; following up after a screening; asking how many hours to patch, what to do if the patch comes off, and asking before stopping a treatment; what to bring; the questions to ask; low-cost eye exams and glasses; and the order of the steps. What we left out: NEI’s research news. This page saves nothing and loads no trackers.