You’re going about your day, and suddenly you see a quick flash of light at the edge of your vision. It’s gone before you can even focus on it. Unsettling, right? You’re probably wondering if it’s serious, if it’ll go away on its own, or if you need to schedule an eye exam right away. That flash has a name, and understanding what’s behind it can help you take the right action fast.
What causes flashes of light in your vision?
Those brief sparkles or streaks in the corner of your eye are called photopsias.¹ They happen when the retina (the light-sensitive layer at the back of your eye) gets stimulated, not by actual light, but by movement or pressure inside the eye itself.
The most common reasons this happens include:
- Vitreous detachment: As we age, the gel-like fluid inside the eye (called the vitreous) begins to shrink and pull away from the retina. This tugging creates the sensation of flashing light.
- Retinal tears or detachment: More serious than vitreous changes, these occur when the retina is pulled away from the tissue beneath it.
- Migraines: Even if you don’t feel the normal tension associated with a headache, ocular migraines can produce zigzag patterns or flashes that affect both eyes.
- Eye pressure or trauma: Even rubbing your eyes too hard can trigger a temporary flash.
When should you be worried?
Not every flash of light is a crisis, but some absolutely need prompt attention. Call your eye doctor right away if you notice:
- A sudden increase in the number of flashes
- New or significantly more floaters (those shadowy spots drifting across your vision)
- A dark curtain or shadow creeping across your field of vision
- Flashes that persist for more than an hour
These symptoms can signal a retinal tear or detachment, which is a medical emergency. Acting quickly can protect your sight.
What happens during an eye exam for flashes?
If you come in reporting flashes, your eye doctor will dilate your pupils to get a clear, wide view of your retina. This is the most effective way to rule out tears, detachment, or other structural changes. A comprehensive eye exam doesn’t just check whether you need a new prescription. It’s a detailed look at the health of the entire eye, including the structures that most people never think about until something feels off.
During that exam, your provider may also:
- Measure the pressure inside your eye
- Assess the vitreous for signs of separation
- Check for any areas of the retina that look thin or compromised
- Discuss your personal risk factors, like nearsightedness or a history of eye injury
Highly nearsighted people are at a higher risk for vitreous detachment and retinal issues, so if you’ve worn glasses or contacts for years, this is worth knowing.
Protect your vision before symptoms get worse
Catching a retinal issue early is one of the best things you can do for your long-term eye health. Many retinal tears, when found in time, can be treated with a simple laser procedure with no surgery and minimal downtime.
If you’ve been seeing flashes, don’t wait it out. Schedule an appointment with Primary Eye Care in Arlington or South Main today.
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