Eye floaters are small shapes that drift across your vision, caused by tiny clumps of protein fibers inside the gel-like fluid that fills your eyeball. They look like specks, threads, cobwebs, or squiggly lines, and they move when you try to look directly at them. Most floaters are harmless and become more common with age, but a sudden increase can signal something more serious happening inside the eye.
What Causes Floaters to Form
Your eye is filled with a clear, gel-like substance called the vitreous. It’s made mostly of water, but it gets its structure from a network of fine collagen fibers. These fibers are normally kept separate by a coating of protective proteins that prevents them from sticking together. As you age, that protective coating breaks down. Without it, the exposed collagen fibers fuse together into larger clumps and strands.
These clumps cast tiny shadows on the retina, the light-sensitive tissue at the back of your eye. Those shadows are what you see as floaters. The process is called vitreous degeneration, and it happens gradually over decades. It’s the same basic aging process that affects collagen in joints and cartilage throughout the body.
At the same time, the vitreous gel slowly shrinks and becomes more liquid. Eventually, it can pull away from the retina entirely, a common event called posterior vitreous detachment. This tends to happen in your 50s, 60s, or 70s and often causes a noticeable burst of new floaters along with flashes of light, usually at the edges of your vision. The flashes are more noticeable in darker environments.
What Floaters Look Like
Floaters take many forms. You might see single dots, clusters of specks, threadlike strands, or shadowy cobwebs. They’re usually gray or black. The defining feature is that they drift when you move your eyes and seem to slide away when you try to focus on them directly. They’re most visible against bright, uniform backgrounds like a white wall, a clear sky, or a lit screen.
Some people notice one or two small floaters that barely register. Others develop larger, denser ones that genuinely interfere with reading or driving. The visual impact depends on the size of the collagen clump, how close it sits to the retina, and where it lands in your field of vision.
Who Gets Them and Why
Age is the biggest factor. The collagen changes that cause floaters begin in your 40s and accelerate from there. But several conditions can bring them on earlier or make them worse:
- Nearsightedness (myopia): People with moderate to severe nearsightedness have elongated eyeballs, which stretches the vitreous and accelerates its breakdown. Floaters often appear a decade or more earlier than average in this group.
- Diabetes: Diabetic retinopathy causes abnormal blood vessels to grow inside the eye. These fragile vessels can leak blood into the vitreous, producing floaters or dark streaks across vision. This type of floater signals active disease and needs prompt attention.
- Eye surgery or injury: Any procedure that disrupts the vitreous, including cataract surgery, can trigger new floaters. Trauma to the eye can do the same.
- Inflammation inside the eye: Conditions like uveitis release inflammatory debris into the vitreous, creating floaters that look different from the typical age-related kind.
When Floaters Signal an Emergency
A few floaters that you’ve had for months or years are almost always benign. The situation changes when you notice a sudden shower of new floaters, especially if they come with flashes of light or a shadow creeping across part of your vision like a curtain being drawn. That pattern can mean the vitreous is pulling on the retina hard enough to tear it.
A retinal tear left untreated can progress to a retinal detachment, where the retina peels away from the back of the eye. This is a sight-threatening emergency. The key distinction: posterior vitreous detachment (the gel pulling away cleanly) is common and usually harmless. A retinal tear or detachment is uncommon but urgent. An eye exam is the only way to tell the difference, which is why any sudden onset of floaters and flashes warrants a same-day or next-day visit to an eye specialist.
How Floaters Are Diagnosed
The exam itself is straightforward. An ophthalmologist or optometrist will use eye drops to dilate your pupils, widening them so light can reach the back of the eye. This lets the specialist examine the vitreous and retina in detail, checking for tears, detachments, or bleeding. The dilation takes about 20 to 30 minutes to kick in and leaves your vision blurry and light-sensitive for a few hours afterward, so you’ll want someone to drive you home.
In some cases, the exam reveals a separate condition called asteroid hyalosis. Instead of dark, drifting shapes, this involves tiny glittering yellow-white particles suspended in the vitreous. These particles are made of calcium and lipid deposits, not collagen. Asteroid hyalosis is usually discovered incidentally during a routine exam and rarely affects vision.
Treatment Options
Most floaters don’t need treatment. Over time, many drift out of your central line of sight or your brain learns to filter them out, making them less noticeable. For the minority of people whose floaters are large, dense, and genuinely disruptive to daily life, two options exist.
Laser Vitreolysis
This in-office procedure uses a focused laser to break apart the collagen clumps causing floaters. It’s noninvasive, performed through a contact lens placed on the eye, and takes about 15 to 20 minutes. In a clinical trial, 54% of patients reported symptom improvement after a single treatment session. An earlier study found lower success rates, with only about one-third of patients reporting significant resolution. The risks include elevated eye pressure, retinal tears, retinal detachment, and cataract formation if the laser contacts the lens, though in the controlled trial, adverse event rates were no different between treated patients and those who received a sham procedure.
Laser vitreolysis works best on large, well-defined floaters that sit away from both the retina and the lens. Small, diffuse floaters scattered throughout the vitreous are harder targets and less likely to respond.
Vitrectomy
This is a surgical procedure where the vitreous gel is removed and replaced with a saline solution. It’s the most effective way to eliminate floaters, but it carries real surgical risks. In a review of 116 consecutive cases, retinal detachment occurred in about 2.5% of patients. Cataract development after vitrectomy is also common, particularly in patients over 50, and many will need cataract surgery within a few years. Because of these risks, vitrectomy is generally reserved for floaters severe enough to significantly impair quality of life or interfere with work and driving.
Living With Floaters
For most people, floaters are an annoyance rather than a medical problem. A few practical strategies help. Wearing sunglasses on bright days reduces the contrast that makes floaters stand out. Adjusting screen brightness or using dark mode can make them less visible during computer work. When a floater lands in your line of sight, a quick up-and-down eye movement shifts the vitreous fluid and moves the clump out of the way temporarily.
The brain is remarkably good at adapting. Floaters that seem impossible to ignore in the first few weeks often fade into the background within a few months as your visual processing adjusts. That adaptation isn’t guaranteed for everyone, especially with large or centrally located floaters, but it’s the most common outcome.