Almost everyone sees floaters at some point. Those small specks, threads, or cobweb-like shapes that drift across your vision when you look at a plain background are so common that most people dismiss them entirely. In the vast majority of cases, that is fine. But in a small percentage of cases, floaters are the first warning sign of a condition that can cause permanent vision loss if not treated within hours.
Knowing the difference between normal floaters and the kind that require an urgent call to an Edmonton eye clinic is exactly what this guide covers.
What Are Eye Floaters?
Floaters are tiny clumps of cells, fibers, or collagen debris within the vitreous, the clear gel that fills the interior of the eye. As you move your eyes, these clumps cast shadows on the retina, creating the appearance of small shapes drifting across your vision. They are most visible when looking at a bright plain surface like a white wall, a clear sky, or a lit screen.
Floaters are extremely common and increase with age. They are also more common in people with moderate to high myopia, after eye surgery, and following inflammation inside the eye. Most people develop a few stable floaters over the course of their lives that they eventually learn to stop noticing.
What Are Flashes of Light?
Flashes appear as brief streaks or arcs of light, usually in the peripheral vision, and occur when the vitreous gel pulls or tugs on the retina. This mechanical stimulation of the retinal cells registers in the brain as light even though no external light source caused it. Flashes are particularly common as the vitreous undergoes posterior vitreous detachment, a normal aging process where the gel gradually separates from the retinal surface. This process happens to most people eventually and is usually harmless.
When Floaters and Flashes Are Normal
A gradual increase in floaters over months or years, particularly in patients over 50 or in those with myopia, is typical of normal vitreous aging. If your floaters have been stable for a long time and you are not noticing new ones, they are very likely benign. Flashes during posterior vitreous detachment are also normal and typically resolve over several weeks to months as the gel completes its separation from the retinal surface.
When Floaters and Flashes Are an Emergency
The following situations require same-day evaluation at an Edmonton eye clinic or emergency services. Do not wait to see if symptoms resolve on their own.
A sudden shower of many new floaters appearing within hours, particularly if it feels like a cloud, swarm, or significant increase in what you normally see, can indicate a retinal tear. The floaters are caused by blood or pigment cells released into the vitreous from a torn retinal vessel. This is not something to monitor from home.
Flashes of light in one eye that persist or worsen, rather than appearing during head movement and then settling, can indicate ongoing traction on the retina. Persistent flashes, especially in one specific area of your visual field, warrant prompt assessment.
A dark curtain or shadow that appears to move across your visual field from one side is the most urgent warning sign associated with floaters. This indicates retinal detachment where the retina has separated from the back of the eye. This is a medical emergency. The faster treatment is initiated, the better the outcome. Every hour of delay increases the risk that the detachment reaches the macula, the central retinal area responsible for detailed vision. Once the macula is involved, vision loss may be permanent.
Any loss of peripheral vision alongside new floaters or flashes warrants immediate emergency care at the Royal Alexandra Hospital or the University of Alberta Hospital if it is outside clinic hours.
How Retinal Tears Are Treated
A retinal tear identified before detachment occurs is treated with laser photocoagulation or cryotherapy. These procedures create a seal around the tear, preventing fluid from lifting the retina further. They are performed as outpatient procedures by a retinal specialist and, when done promptly, are highly effective at preventing progression to full detachment. A retinal detachment that has already occurred requires more extensive surgical repair, with outcomes significantly better when surgery takes place before the detachment reaches the macula.
Questions Edmonton Patients Ask About Floaters and Flashes
Q: I have always had a few floaters. How will I know if new ones are significant?
The key distinction is sudden versus gradual. If you are used to seeing two or three small spots and one morning you notice ten, or a cloud-like cluster, or something that feels dramatically different from your usual floaters, that is the change to act on. A stable floater that you have had for years is almost always benign. A sudden significant increase in the same eye, especially with flashes, is not.
Q: I saw flashes last night but they are gone now. Do I still need to see someone?
If the flashes were new, significant, or accompanied by new floaters, yes. Flashes that occur once or twice during a specific head movement and then do not return are often part of the normal vitreous separation process. Flashes that were numerous, accompanied by floaters, or followed by any change in your visual field are worth having assessed promptly rather than waiting to see if they return.
Q: Are floaters worse with myopia?
Yes. People with moderate to high myopia have a longer eyeball, which affects the vitreous gel structure. The gel in a myopic eye tends to liquify and degenerate earlier, making floaters more common and posterior vitreous detachment more likely to occur at a younger age. If you have myopia and notice new floaters, the threshold for booking an urgent assessment should be lower than for someone without a prescription.
Q: Can floaters go away on their own?
Many floaters do become less noticeable over time. The brain learns to filter out stable floaters, and they literally sink toward the bottom of the vitreous cavity over months to years. They rarely disappear completely but they stop being as visually disruptive. Floaters that are causing significant visual impairment in one specific area of your vision are worth discussing with your optometrist, as there are procedures available in some cases to address them.
Q: What is the difference between floaters and a visual migraine?
Visual migraines produce distinct symptoms: typically a flickering arc of light or a zig-zag pattern (scintillating scotoma) that expands across the visual field over 20 to 30 minutes and then resolves. They usually affect both eyes simultaneously and are not associated with floaters. Standard eye floaters drift, are stable in appearance, and do not expand. Retinal tears produce floaters that suddenly increase in number and may be associated with flashes of light in one eye, not an expanding arc pattern.
Book an Urgent Eye Assessment in Edmonton
If you are experiencing new floaters, persistent flashes, or any change in your visual field and you are unsure whether it requires urgent attention, call us. Eyes On Optometry makes every effort to accommodate same-day appointments for patients with potential retinal symptoms. Contact us immediately for urgent eye care in Edmonton. For a broader guide to which symptoms need prompt attention, read our post on 10 signs you need to see an eye doctor in Edmonton.