You’re going about your day when suddenly, a speck drifts across your field of vision. You try to blink it away, but it stays put. Or maybe you see a quick flash of light off to the side, like a camera going off, even though there’s nothing there. These moments can feel strange or even alarming if you’ve never experienced them before. They’re called floaters and flashes, and they’re more common than you might think.
In most cases, they’re harmless. But sometimes, they’re a sign that something more serious is going on with your eye. Let’s take a closer look at what floaters and flashes are, why they happen, and when it’s time to call your eye doctor.
What Are Floaters?
Floaters are small shapes that seem to drift through your vision. They can look like dots, squiggles, strands, cobwebs, or even tiny bugs. They’re especially noticeable when you’re looking at a plain background like a blue sky or a white wall. Floaters are actually tiny bits of collagen or gel inside the vitreous—the clear, jelly-like substance that fills the inside of your eye. As we age, this gel begins to shrink and liquefy, and tiny fibers within it can clump together. When light enters your eye, those clumps cast shadows on your retina, which is what you’re seeing as floaters.
What Are Flashes?
Flashes are brief bursts or flickers of light that appear in your field of vision. They’re often described as lightning streaks, sparks, or camera flashes. Flashes happen when the vitreous gel inside your eye tugs or pulls on the retina. This tugging sends signals to your brain that get interpreted as light, even though no light is actually entering the eye.
Are Floaters and Flashes Normal?
Yes—up to a point. Occasional floaters are common, especially as you get older. Many people start noticing them in their 40s or 50s. They can also appear after certain eye surgeries, injuries, or if you’re very nearsighted.
Flashes are also not unusual and can occur occasionally without any serious cause. But new or frequent flashes should always be checked out, especially if they come on suddenly or are accompanied by an increase in floaters.
When Should I Be Concerned?
Floaters and flashes are usually harmless, but they can be warning signs of a serious condition called retinal detachment. This is when the retina—the light-sensitive layer at the back of your eye—pulls away from the wall of the eye. A detached retina can lead to permanent vision loss if not treated quickly.
You should call your eye doctor immediately if you notice:
- A sudden increase in floaters, especially if they seem like a shower of black dots or “pepper flakes.”
- New flashes of light, especially if they’re persistent or come on suddenly.
- A dark shadow or curtain that moves across your vision.
- A sudden loss of peripheral (side) vision.
- Blurred vision or a noticeable drop in visual clarity.
What Causes Floaters and Flashes?
There are a few different causes, most of which are related to natural changes in the eye as you age:
- Posterior Vitreous Detachment (PVD): This is the most common cause of floaters and flashes. It happens when the vitreous gel shrinks and pulls away from the retina. It’s a normal part of aging and often doesn’t require treatment, but it can lead to retinal tears in some cases.
- Retinal Tear or Detachment: Sometimes, when the vitreous pulls away, it can tug hard enough to tear the retina. This tear can let fluid under the retina, leading to detachment. This is a medical emergency and requires prompt attention.
- Eye Injury: Trauma to the eye can cause floaters or flashes due to sudden changes in the vitreous or retina.
- Inflammation (Uveitis): Inflammation inside the eye can cause floaters due to the presence of inflammatory debris in the vitreous.
- Bleeding in the Eye: Conditions like diabetic retinopathy can cause blood vessels to leak into the vitreous, creating floaters.
How Are Floaters and Flashes Diagnosed?
If you’re experiencing floaters or flashes, your eye doctor will perform a comprehensive eye exam. This often includes dilating your pupils so they can examine the back of your eye in detail. They’ll look for signs of a vitreous detachment, retinal tear, or detachment. In some cases, additional testing like optical coherence tomography (OCT) or ultrasound may be used to get a better look inside your eye.
What’s the Treatment?
If your floaters and flashes are due to a posterior vitreous detachment and your retina is intact, no treatment is usually needed. The floaters may become less noticeable over time as your brain learns to ignore them.
If a retinal tear or detachment is found, treatment is urgent. Laser therapy or cryopexy (freezing treatment) can be used to seal a tear. In the case of a detachment, surgery may be required.
For floaters that are especially bothersome and don’t go away, there are options such as laser vitreolysis or vitrectomy, but these are typically reserved for severe cases due to potential risks.
Can You Prevent Floaters or Flashes?
There’s no guaranteed way to prevent floaters or flashes, especially if they’re caused by normal aging. But there are a few things you can do to reduce your risk of complications:
- Get regular eye exams, especially if you’re over 50 or are very nearsighted.
- Protect your eyes from injury by wearing safety glasses when needed.
- Manage chronic health conditions like diabetes and high blood pressure.
- See your eye doctor right away if you notice any sudden changes in your vision.
Final Thoughts
Seeing floaters or flashes can be surprising, especially if it’s a new experience. Most of the time, they’re a normal part of how your eyes age. But they can also signal something more serious, so it’s important to know what to watch for.
If you’re ever unsure, it’s better to get your eyes checked and be told it’s nothing to worry about than to ignore something that needs quick treatment. Your vision is too important to take chances with.
Whether you’re dealing with a few annoying floaters or something more concerning, Pearle Vision is here to help. Schedule an eye exam, and we’ll make sure everything looks the way it should—both inside and out.