A small speck that drifts across a bright sky, a white wall or your phone screen can be distracting. These spots, threads or cobweb-like shapes are commonly called floaters. They are often harmless, particularly when they have been present for a long time. But a sudden change in floaters can sometimes be the first warning sign of a retinal problem that needs urgent assessment.
Knowing the difference can protect your sight. If you notice a new shower of spots, flashing lights or a dark curtain in your vision, do not wait to see if it settles. Arrange an urgent eye examination the same day.
What are eye floaters?
Floaters are small shadows cast onto the retina, the light-sensitive tissue at the back of your eye. They come from changes in the vitreous – the clear, gel-like substance that fills the inside of the eye.
With age, the vitreous gradually becomes more liquid and small fibres within it can clump together. When light enters the eye, these clumps create shadows that move as your eye moves. You may notice them most clearly against pale, bright backgrounds.
Floaters can look different from person to person. Some people see dots, while others notice wispy lines, rings or cobwebs. They tend to drift when you move your eyes, then slowly settle. Trying to look directly at one often makes it seem to move away.
For many adults, especially from middle age onwards, occasional stable floaters are a normal part of ageing. However, normal does not mean that every new floater should be ignored.
Why do floaters appear?
The most common cause is a posterior vitreous detachment, often shortened to PVD. This sounds alarming, but it is a common age-related change. As the vitreous gel shrinks, it can pull away from the retina. A PVD itself usually does not damage vision, although it may cause a noticeable new floater or flashes of light.
Other possible causes include short-sightedness, eye injury, inflammation inside the eye, bleeding in the eye and complications related to diabetes. Floaters may also occur after eye surgery. People who are very short-sighted, have had cataract surgery, have a family history of retinal detachment or have had an injury to the eye may have a higher risk of retinal tears or detachment.
The key issue is not simply whether you have floaters. It is whether they are new, changing quickly or occurring with other symptoms.
When are floaters an emergency?
A retinal tear can occur when the vitreous pulls firmly enough to create a break in the retina. Fluid can then pass through that break and lift the retina from the back of the eye, causing a retinal detachment. Prompt treatment can often prevent or limit permanent vision loss.
Seek urgent eye care if you experience a sudden onset of floaters, particularly if there are many new spots or a shower of black dots. Flashes of light at the edge of your vision are another important warning sign, especially when they are new or persistent.
You should also be assessed urgently if you notice any of the following: a shadow, veil or curtain coming across your vision; missing areas of sight; blurred or reduced vision; new floaters after an eye injury; or eye symptoms following recent surgery. These changes do not always mean there is a retinal tear or detachment, but they cannot be safely diagnosed at home.
If your vision has suddenly reduced significantly, or you have severe eye pain, contact an urgent eye care provider or seek emergency medical attention. Do not drive yourself if your vision is affected.
Flashes, floaters and migraine: what is the difference?
Flashing lights can have more than one cause. Retinal flashes are often brief streaks, sparks or flickers at the side of the vision. They may be more noticeable in a dim room or when moving your eyes.
A visual migraine can also cause lights, zigzags or shimmering patterns. These effects often begin near the centre of vision, expand over several minutes and usually affect both eyes, even if it feels as though they are on one side. They typically resolve within an hour and may occur with or without a headache.
The distinction is not always straightforward. New visual symptoms deserve professional advice, particularly when you are unsure whether the effect is in one eye or both, when symptoms are accompanied by new floaters, or when any part of your vision remains altered.
What happens at an eye examination for floaters?
A thorough examination does more than check whether you need new glasses. Your optometrist will ask when the floaters began, whether they have changed and whether you have noticed flashes, a shadow or reduced vision. This history helps determine how urgently the retina needs to be checked.
Your vision, eye pressure and the front of the eye may be assessed. In many cases, dilating drops are used to widen the pupil so the optometrist can examine the vitreous and the far edges of the retina in detail. The drops can make near vision blurry and increase light sensitivity for several hours, so bringing sunglasses is sensible. You may also prefer to arrange someone else to drive you home.
If a retinal tear, detachment or another significant concern is suspected, urgent referral to an ophthalmologist may be needed. Boda Family Eye Care provides comprehensive eye assessments and can coordinate referral when specialist treatment is required.
Can floaters be treated?
When an examination confirms that the retina is healthy, most floaters do not need treatment. The brain often becomes less aware of them over time, even though the floater itself may still be present. This can take weeks or months, and some people find it helpful to avoid repeatedly checking for them against bright backgrounds.
If floaters are caused by inflammation, bleeding or another eye condition, treatment focuses on the underlying cause. Retinal tears may be treated with laser or other procedures by an ophthalmologist to reduce the risk of detachment.
For persistent, severe floaters that significantly affect daily life, surgical removal of the vitreous, called a vitrectomy, may be considered in selected cases. It is not a routine option because surgery carries risks, including infection, retinal detachment and earlier cataract development. Some clinics offer laser treatment for selected floaters, but suitability varies and it is not appropriate for every type of floater. A careful discussion with an eye specialist is essential before considering any procedure.
Looking after your eye health between visits
There is no proven home remedy that dissolves ordinary vitreous floaters. Eye drops, supplements and online products should not replace an examination when symptoms are new. A healthy lifestyle supports general eye health, but it cannot rule out a retinal tear.
Pay attention to your usual vision so changes are easier to recognise. If you have diabetes, keep regular eye examinations as recommended, since diabetes can affect the blood vessels in the retina and occasionally lead to bleeding that appears as floaters. Wear protective eyewear for work, sport and DIY tasks where eye injury is possible.
Most importantly, trust a sudden change in your vision. Stable floaters can be annoying, but new floaters with flashes, a shadow or reduced sight need timely care. A prompt examination offers reassurance when everything is healthy and the best chance of protecting vision when treatment is needed.