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Eye floaters and flashes of light: what is normal, the warning signs, vitreous detachment, the eye exam, and treatment
For someone who sees spots, threads, squiggly lines or little cobwebs drifting across their vision; for someone who suddenly sees a lot of new floaters, flashes of light or a shadow like a curtain; for someone 50 or older whose eye doctor says the gel inside the eye is pulling away (vitreous detachment); and for someone whose floaters get in the way of daily life. The National Eye Institute (NEI, part of the NIH) says most people have floaters that come and go and often don’t need treatment, but sometimes they are a sign of a more serious eye condition. This page passes on, by name, what NEI says: what is normal, the warning signs, why floaters happen, vitreous detachment, the dilated eye exam, and treatment. It builds the words to say to the eye doctor, and prints a card to keep.
Right now
- Suddenly a lot of new floaters, flashes of light, or a dark shadow like a curtain over part of your vision? NEI says it can be a retinal tear or detachment, which can be a medical emergency: go to your eye doctor or the emergency room right away. Ours: call 911 in an emergency, and don’t drive yourself if your sight is affected.
- Floaters with eye pain, a red eye, or after a hit to the eye? Get it checked right away. A hurt eye: the eye injury page (ours).
- Can’t afford an eye exam? 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 · Retinal detachment · Uveitis · Diabetic retinopathy · Cataracts · Nearsightedness and other refractive errors · An eye injury.
- Care and costs: Eye care you can afford · 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 four National Eye Institute (NIH) pages: Floaters (last updated December 4, 2024), Vitreous Detachment (December 4, 2024), Get a Dilated Eye Exam (November 26, 2025) and Vitrectomy (December 6, 2024). Ours: calling 911 in an emergency (NEI says your eye doctor or the emergency room right away); not driving yourself when your sight is affected; that floaters with eye pain, a red eye or after a hit to the eye are worth getting checked right away; the eye injury page; 988 for thoughts of suicide; telling the eye doctor about being very nearsighted, diabetes or cataract surgery; what to bring; the questions to ask; low-cost eye exams; and the order of the steps. What we left out: NEI’s research news and its external video. This page saves nothing and loads no trackers.