Why you see floaters and when to worry about them
Floaters are moving spots, threads or shadowy shapes that drift across your vision. They form when microscopic clumps in the vitreous, the gel filling the eye, block light from reaching the retina cleanly. Most become noticeable with age, but a sudden increase can signal a retinal tear, so the timing and any associated symptoms matter.
Kramer Family Eyecare in Columbia, Missouri, provides comprehensive eye examinations, contact-lens fittings, glaucoma care and retinal imaging for families across mid-Missouri. Its drandrewkramer.com/services page describes the available care. Although the clinic serves mid-Missouri families, the symptom guidance below also applies in Australia, where urgent care means a public hospital emergency department rather than waiting for a routine optometrist appointment.
How floaters appear in everyday vision
Floaters may look like a dark dot, a loose thread, a translucent cobweb or a faint sheet. Because these shapes sit in the vitreous, they move as your eyes move and may drift when you look away from a bright, plain surface. Australians often describe them as spots or cobwebs, particularly when they first notice them against a blue sky or white print.
Some people also notice brief streaks of light, known as flashes, especially in dim light. A gradual floater without flashes or other visual changes is often benign, but frequency alone does not make new symptoms safe. The timing matters: what began gradually over months has a different meaning from a sudden shower of spots.
| Feature | Common ageing pattern | Possible retinal warning pattern |
|---|---|---|
| Onset | Gradual over weeks or months | Sudden cluster or rapid increase |
| Eyes | One or both eyes | Usually one eye, especially with a shadow or curtain |
| Accompanying signs | Vision otherwise clear, without new flashes | New flashes, shadow, curtain or reduced peripheral vision |
| Suitable response | Arrange an eye examination if not previously assessed | Seek same-day urgent eye assessment |
What ageing changes do inside the eye
The vitreous is mostly water with a network of collagen fibres. As you age, it liquefies unevenly and the fibres clump, creating small shadows that move across the retina. These changes often become noticeable after 60. A gradual increase over months, with stable vision and no flashes, usually fits an ageing-related change.
As the vitreous separates from the retina, it can tug on it and create floaters. This is called a posterior vitreous detachment. It often occurs without permanent damage, but stronger traction can pull a small retinal tear. A sudden shower of spots therefore needs an examination, even if your central vision still seems sharp.
Floaters can also appear in younger people, often from developmental remnants, while trauma or inflammation can disturb the vitreous. Zig-zag flashes or a temporary blind spot affecting both eyes may be migraine aura rather than floaters, but a new visual pattern still needs checking.
Other causes worth investigating
After a blow to the eye, inflammatory cells or blood can cast shadows inside the eye. This matters for anyone involved in contact sports, DIY work or motorcycling. Tell the clinician about the injury even if vision initially returned to normal, because the retina may need a dilated examination and follow-up review.
Diabetes can cause changes in the vitreous and retina that affect floaters. Fluid behind the retina, called diabetic macular oedema, affects central vision rather than floating shapes, but both problems may coexist. People with diabetes need regular retinal screening, particularly when vision changes suddenly.
Some medicines and eye conditions cause blur, glare or light sensitivity that people mistake for floaters. A true floater moves; glare follows a light source and changes with head position. An optometrist can examine the front of the eye, retina and optic nerve to identify the cause.
In Australia, Aboriginal and Torres Strait Islander people have higher rates of glaucoma and glaucoma-related vision loss. Glaucoma usually does not create floaters, but regular checks through local Aboriginal health services can detect other retinal problems while they remain treatable.
Warning signs that need urgent assessment
Arrange an emergency eye assessment the same day if floaters arrive suddenly as a shower of dozens of spots or increase rapidly. A curtain or shadow across part of your vision, new loss of peripheral vision or marked blurring are also warning signs. These symptoms may indicate a retinal tear or detachment, which can threaten permanent sight.
A retinal tear can sometimes be sealed with laser or freezing treatment before the retina detaches. A detachment needs prompt retinal surgery; waiting days can reduce the visual outcome. In Australia, call 000 if sudden visual loss makes travel unsafe, or go to the nearest public hospital emergency department with someone accompanying you.
New flashes with a floater, a dark curtain in one eye or a moving shadow need attention even when the centre of your vision remains clear. Australian driving and licence rules vary by state and territory, so any visual disturbance affecting safe driving should be assessed before getting behind the wheel.
What a dilated eye examination involves
A comprehensive examination starts with your symptoms: when they began, whether one or both eyes are affected, any flashes, injury or headache, and your diabetes or medication history. Visual acuity and pressure checks establish a baseline, while a slit-lamp examination looks at the front of the eye. The key step is a dilated retinal examination, not simply a stronger glasses prescription.
A dilated retinal inspection can reveal tears, while optical coherence tomography maps changes in the macula and retinal layers. If clouding prevents a clear view, a specialist may use an ultrasound of the eye. These tests help distinguish common vitreous changes from tears, bleeding, oedema or other causes requiring treatment.
In Australia, optometrists provide primary eye care and can examine, dilate and refer to an ophthalmologist. Medicare usually does not cover routine eye examinations, everyday glasses or contact lenses, although a GP referral can open subsidised pathways for eligible problems. Private insurance, pension concessions and Specsnetwork stores may help with routine costs.
Protecting your sight between examinations
Daily habits cannot stop every age-related floater, but they support overall eye health. Choose sunglasses that block UV and fit closely enough to cover the eyes, and wear a broad-brimmed hat outdoors. This matters around Australian beaches and cricket ovals, where UV exposure can remain high even under cloud.
Manage blood pressure, blood sugar and weight, stop smoking, and keep to the review schedule advised for your risk factors. A healthy diet supports the retina but cannot dissolve established floaters: no food, supplement or eye drop has been proved to remove them. If you have diabetes, keep retinal screening appointments on track.
- Arrange a prompt dilated eye examination for new or changing floaters, even without other symptoms.
- Seek same-day emergency care for a sudden shower, new flashes, a curtain or shadow, or lost peripheral vision.
- Record when the symptoms began, which eye is affected and whether flashes appeared.
- Keep diabetes and blood-pressure reviews on schedule, and use UV-blocking sunglasses outdoors.
Persistent floaters can make stairs, kerbs and pavements harder to judge, especially for older adults. A podiatrist may identify foot or gait problems that add to fall risk, as this French-language explanation of podiatry and walking problems describes. Any new visual change should still be assessed rather than blamed on balance alone.
Your next step with changing vision
New floaters without warning signs usually need a timely eye examination rather than emergency treatment. If the symptom has been stable for months and you have already been examined, an optometrist can monitor it and discuss whether it affects daily life. For people who drive for work or spend time outdoors, reduced confidence in vision may matter more than counting individual spots.
Treatment depends on the cause. Retinal tears, detachment, inflammation and diabetes-related swelling need specific medical or surgical care. Persistent bothersome floaters in otherwise healthy eyes may occasionally be treated with a vitrectomy, which removes some vitreous, but it carries risks, including cataract, so it is not a routine first choice. Kramer Family Eyecare’s on-site optical lab can correct refractive errors, but glasses cannot remove a retinal tear or vitreous opacity.
If you currently have sudden floaters, new flashes or a curtain-like shadow, go to the nearest public hospital emergency department today for a dilated retinal assessment, accompanied if possible.