--- title: "Floaters and flashes | Eye Health Guide" description: "PVD versus retinal tear, who should skip this page, monitoring, and when a floater shower is an emergency. Clinically reviewed." url: https://eyehealthguide.org/conditions/floaters-and-flashes/ source: Eye Health Guide licence: "General information only. Cite the URL and the named medical reviewer." --- Condition # Floaters and flashes Medical reviewer [Mr Mohamed Mohyudin](https://eyehealthguide.org/reviewers/mohamed-mohyudin/)· Last recorded site review July 6, 2026 ### About this review This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded. [How review works](https://eyehealthguide.org/reviewers/) · [Official biography & credentials](https://mohamedmohyudin.co.uk/author/mohamed-mohyudin/) Quick answer Floaters are drifting spots or threads from changes in the vitreous gel. Brief flashes can occur when the gel tugs the retina. Long-standing stable floaters are usually harmless. A sudden shower of floaters, new repeated flashes, or a dark curtain needs same-day emergency eye assessment to rule out a retinal tear or detachment. Do not use this page as a reason to wait overnight if those red flags are present. References for this section: NHS — Floaters and flashes in the eyes ↗National Eye Institute - Floaters ↗ ### On this page ⌄ 1. Visual guide 2. Your next step 3. What are floaters and flashes — and who should skip this page? 4. How do I tell a nuisance floater from an emergency? 5. What will the examination involve? 6. Can bothersome floaters be removed? 7. Related conditions 8. Related symptoms 9. Treatments & Surgery 10. Frequently asked questions Understand it visually ## Explore the diagram **How the eye works** Clear vitreous gel fills much of the eye. Light passes through it to reach the retina. **What changes** Clumps in the vitreous can cast shadows called floaters. As the gel changes or separates, it may pull on the retina and cause flashes; an examination checks for a tear. 1. Lens 2. Retina 3. Optic nerve Simplified educational diagram. It does not show what every person sees or replace an eye examination. Sources for this information ## What are floaters and flashes — and who should skip this page? The vitreous is a clear gel. With age it liquefies and shrinks, casting shadows (floaters). When it pulls on the retina you may see a brief flash, especially in dim light. Skip this page and go to emergency eye care if you have a sudden swarm of new floaters, repeated new flashes, a dark curtain, or sudden vision loss — reading more paragraphs does not examine your retina. Posterior vitreous detachment (PVD) is very common after middle age. Most PVDs are benign, but the same pull can tear the retina at the same moment. That is why new symptoms need a dilated check, not a web self-test. Diabetes, high myopia, previous surgery or injury raise the chance that a ‘floater’ is blood or a tear. Mention those facts at triage. [Posterior vitreous detachment](https://eyehealthguide.org/conditions/posterior-vitreous-detachment/)[Retinal tear](https://eyehealthguide.org/conditions/retinal-tear/)[Retinal detachment](https://eyehealthguide.org/conditions/retinal-detachment/)[Are eye floaters dangerous?](https://eyehealthguide.org/answers/are-eye-floaters-dangerous/) References for this section: NHS — Floaters and flashes in the eyes ↗National Eye Institute - Floaters ↗ ## How do I tell a nuisance floater from an emergency? Stable floaters you have had for months or years, unchanged, are usually a nuisance. Timing decides urgency: hours to days of a new shower, new flashes, or a spreading shadow are the emergency pattern. Patterns — still get examined if you are unsure | Pattern | Usual meaning | Action | | --- | --- | --- | | One or two old threads, unchanged for months | Often PVD or vitreous specks the brain has learned to ignore | Mention at the next routine test | | Sudden cobweb or ring plus flashes | Often new PVD — must exclude a tear | Same-day dilated retinal exam | | Shower of black dots, curtain, or sudden blur | Tear, detachment, or vitreous haemorrhage until proven otherwise | Emergency eye care now | References for this section: NHS — Floaters and flashes in the eyes ↗National Eye Institute - Floaters ↗ ## What will the examination involve? Dilating drops and a look at the far retina, sometimes with a contact lens on the eye. The check is uncomfortable in bright light, not usually painful. Most people are reassured. If a tear is found, laser or freezing can often seal it before detachment spreads. Detachment usually needs surgery. Do not drive until the drops wear off. Do not assume an undilated ‘quick look’ was enough for new flashes. [When are flashes an emergency?](https://eyehealthguide.org/answers/when-are-flashes-an-emergency/)[Vitreous haemorrhage](https://eyehealthguide.org/conditions/vitreous-haemorrhage/)[Flashes and floaters symptom guide](https://eyehealthguide.org/symptoms/flashes-and-floaters/) References for this section: NHS — Floaters and flashes in the eyes ↗National Eye Institute - Floaters ↗ ## Can bothersome floaters be removed? Usually observation is best. Vitrectomy can remove persistent floaters in selected people after counselling about surgical risk. Laser ‘floater treatment’ is not a casual cosmetic. The priority when symptoms are new is excluding a tear, not shopping for removal. If you have diabetes and a sudden cloud of dark floaters, that can be blood in the gel — still an emergency, even if you already know you have retinopathy. References for this section: NHS — Floaters and flashes in the eyes ↗National Eye Institute - Floaters ↗ ## Related conditions ## Related symptoms ## Treatments & Surgery ## Frequently asked questions ### Are floaters normal? Yes, especially after 50 and in short-sighted eyes. Stable long-standing floaters are usually harmless. New or suddenly increased floaters need urgent assessment. ### What causes flashes of light? Mechanical pull on the retina from vitreous movement — common in PVD. Migraine flashes are usually binocular zigzag patterns lasting minutes; retinal flashes are often brief and in one eye. New retinal-type flashes still need a dilated exam. ### Can floaters be removed? Usually no treatment is needed. Vitrectomy is reserved for selected bothersome cases because it carries surgical risk. ### How do I know if I have a retinal detachment? You cannot know from a website. Warning signs are a sudden floater increase, flashes, and a dark curtain. That is an emergency until examined. ### Does diabetes increase floater risk? Yes. Vitreous haemorrhage can cause sudden dark floaters. Report sudden changes the same day if you have diabetes. Your next step ## Take this to your appointment Seek urgent assessment for first-time or suddenly increasing floaters or flashes, especially with blurred vision. A dark curtain, shadow or sudden loss of sight needs immediate help. - Was the whole retina examined after the pupil was dilated? - Is there a retinal tear, detachment or another cause? - Do I need another examination, and when? - Which changes should bring me back immediately? Sudden loss of sight, severe eye pain or a dark curtain across vision needs immediate assessment. Do not wait to complete a worksheet. ## Sources for this information These references support the information on this page. Follow the linked source for its full context. - [NHS — Floaters and flashes in the eyes](https://www.nhs.uk/symptoms/floaters-and-flashes-in-the-eyes/) - [National Eye Institute - Floaters](https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/floaters)