From the blog
Why Do I See Flashing Lights in My Eye? Your Questions, Answered
Why Do I See Flashing Lights in My Eye? Your Questions, Answered
Flashing lights in your vision can stop you cold. Are they harmless? Are they an emergency? The answer depends on details that only an examination can reveal , but knowing the right questions to ask puts you ahead. This guide walks through every major concern patients on the Delmarva peninsula bring to our team at Atlantic Retina Center, from what causes flashes to when to call us the same day you notice them.
What exactly are flashing lights in the eye?
Flashing lights , called photopsias , are brief bursts, sparks, or streaks of light that appear without any actual light source. They can look like camera flashes, lightning bolts, or shimmering arcs at the edge of your vision. The pattern, timing, and which eye is affected all carry diagnostic meaning, which is why describing your symptoms precisely to your retina specialist matters.
What causes flashing lights in the eye?
Several conditions can produce photopsias. The most common causes fall into a few clear categories.
Posterior vitreous detachment (PVD)
The most frequent cause is posterior vitreous detachment, or PVD. The vitreous is the clear, gel-like substance that fills the space between the lens and the retina at the back of the eye. As we age, the vitreous gradually shrinks and pulls away from the retinal surface. When it tugs on the retina during this process, the retinal cells interpret that mechanical pull as flashes of light. PVD is a natural part of aging and becomes increasingly common after age 50.
Retinal tear
If the vitreous pulls on the retina with enough force during a PVD, it can create a tear in the retinal tissue. A retinal tear is more serious because fluid from inside the eye can seep through the opening and collect beneath the retina, which may lead to retinal detachment. Flashing lights from a retinal tear are often accompanied by a sudden increase in floaters or the appearance of a shadow in your side vision. Any new or sudden flashing lights deserve a prompt evaluation for this reason.
Migraine visual aura
Migraine can produce visual disturbances called aura, which may include flashing, shimmering, or zigzag patterns of light. Migraine aura typically affects both eyes at the same time, builds and expands across the visual field over the course of 20 to 30 minutes, and may or may not be followed by a headache. This pattern is different from the brief, peripheral flashes linked to retinal conditions. If you are unsure whether your symptoms come from migraine or a retinal problem, a retina specialist examination is the safest course of action.
Other conditions
Inflammation inside the eye, called uveitis, can cause flashing lights along with redness or sensitivity to light. Pressure applied directly to the eye can briefly stimulate the retina and cause a flash. In less common cases, flashing lights may be related to the optic nerve or other structures. A thorough examination is the only reliable way to identify the underlying cause.
When are flashing lights an emergency?
Not every episode of flashing lights requires a same-day visit, but certain combinations of symptoms should never be ignored.
Contact a retina specialist right away if you experience any of the following:
- A sudden onset of flashing lights you have never had before
- Flashes paired with a rapid increase in floaters or new cobweb-like shapes in your vision
- A shadow, curtain, or dark area spreading across any part of your visual field
- Flashes accompanied by a decrease in your overall vision
These combinations can signal a retinal tear or an early retinal detachment, both of which benefit greatly from fast treatment.
When a retinal tear is found before fluid has passed through it, a retina specialist can often seal it with a brief in-office procedure. This is far simpler than repairing a full retinal detachment, which requires surgery. Because some retinal tears develop days or even weeks after the vitreous first separates from the retina, follow-up visits are recommended even when the initial examination looks normal.
When are flashing lights less urgent?
If you have a known history of migraine with visual aura and your current symptoms match your typical pattern exactly, this is generally less urgent than new or unexplained flashes. Similarly, if you have previously been diagnosed with PVD and your symptoms have remained stable, a scheduled follow-up may be appropriate rather than a same-day visit. However, any change in the pattern, frequency, or character of your flashing lights should prompt a timely call to your retina specialist, because even familiar symptoms can sometimes indicate a new development.
What happens during a retinal evaluation for flashing lights?
When you come in for an evaluation, our team follows a careful process to identify the cause of your flashing lights and determine whether treatment is needed.
Dilated eye examination
The most important part of the visit is a dilated eye examination. Your retina specialist uses drops to widen the pupil, then examines the full retina using specialized instruments including an indirect ophthalmoscope and a slit lamp with a magnifying lens. The peripheral retina, where tears most commonly form, receives particularly close attention. This examination can detect retinal tears, areas of thinning, bleeding, or detachment that would not be visible through an undilated pupil.
Retinal imaging
Our team uses advanced imaging to support and document the clinical examination. Optical coherence tomography (OCT) provides detailed cross-sectional images of the retina and can reveal subtle changes at the point where the vitreous meets the retinal surface. Wide-field retinal photography captures a broad, panoramic view of the retina for documentation and comparison at future visits , a practice our team follows at every visit to track changes over time. If blood in the vitreous or dense floaters block a clear view, ultrasound imaging allows us to assess the retinal surface even when direct examination is limited.
Your follow-up plan
If the initial examination shows an uncomplicated PVD with no retinal tear, your retina specialist will typically schedule a follow-up visit in four to six weeks. This follow-up matters because retinal tears can appear after the initial separation event. If your symptoms worsen before that visit , more frequent flashes, a new wave of floaters, or any shadow in your vision , contact us right away rather than waiting for the scheduled appointment.
What might be diagnosed after an evaluation for flashing lights?
Uncomplicated posterior vitreous detachment
The most common finding is a PVD with no tear or detachment. The flashing lights are caused by the vitreous continuing to pull gently on the retina as the separation process completes. These flashes typically become less frequent and less noticeable over several weeks to months as the vitreous moves further away from the retinal surface. No procedure is needed, but monitoring remains important to catch any complications that could appear later.
Retinal tear
If a retinal tear is found, prompt treatment is recommended to prevent it from progressing into a detachment. Tears often appear as horseshoe-shaped breaks in the peripheral retina. The size, location, and number of tears guide the treatment approach. When detected early, retinal tears can be sealed effectively with laser or cryotherapy, both of which are performed in our office.
Retinal detachment
When fluid has already passed through a tear and accumulated beneath the retina, a retinal detachment has occurred. The extent of the detachment and whether the macula , the central part of the retina responsible for sharp vision , is involved will determine how urgently surgery is needed and which approach is best.
Vitreous hemorrhage
Sometimes a retinal tear disrupts a small blood vessel, causing bleeding into the vitreous. Vitreous hemorrhage can also result from conditions like proliferative diabetic retinopathy, in which fragile new blood vessels grow on the retinal surface and bleed easily. When blood is present in the vitreous, it raises concern for an underlying retinal tear, and additional imaging such as ultrasound may be needed to examine the retina when the blood blocks a direct view.
How are flashing lights treated?
Treatment depends entirely on what is found during the examination.
Observation for uncomplicated PVD
When no tear or detachment is present, the recommended approach is careful observation. The flashing lights will typically reduce on their own as the vitreous separation finishes and traction on the retina fades. No medication or procedure is required. Our team will schedule regular follow-up visits to confirm that the retina remains healthy.
Laser photocoagulation for retinal tears
Laser photocoagulation is the most common treatment for a retinal tear. During this in-office procedure, a focused laser beam creates a ring of small, precise burns around the tear. As these burn sites heal, they form scar tissue that bonds the retina firmly to the underlying tissue and seals the tear shut. The procedure is performed at the slit lamp, requires only topical (eye drop) anesthesia, and takes just a few minutes. Most patients can return to normal activities the same day.
Cryotherapy for retinal tears
Cryotherapy uses extreme cold instead of heat to create a seal around a retinal tear. A small probe is placed against the outside of the eye wall, and a freeze is applied that produces the same type of protective scar tissue as laser treatment. Cryotherapy is often used when a tear is located in an area that laser cannot easily reach, or when bleeding in the vitreous prevents the laser from working effectively.
Surgical repair for retinal detachment
A retinal detachment requires surgery to reattach the retina and restore the eye’s structure. The main surgical options include pars plana vitrectomy, scleral buckling, and pneumatic retinopexy. The choice depends on the type, size, and location of the detachment, as well as whether the macula is still attached. Repairing the detachment before the macula is affected gives the best chance for a strong visual outcome.
Common Questions About Flashing Lights in the Eye
Can I safely wait a few days if my flashing lights do not seem that bad?
Waiting is not advisable when flashing lights are new or sudden, because there is no reliable way to judge the severity of a retinal tear without an examination. A tear that feels mild can still allow fluid to pass beneath the retina within hours to days. If your symptoms are brand new, the safest approach is to contact a retina specialist on the same day they begin, even if they seem minor at first.
Will my flashing lights go away on their own?
If the cause is an uncomplicated PVD, the flashes do tend to fade over weeks to months as the vitreous moves further from the retina. However, this natural improvement only applies once a retinal tear has been ruled out. If your flashes are due to a tear that has not been treated, the symptom will not simply resolve and the risk of detachment remains until the tear is sealed.
Do flashing lights always mean my vision is at risk?
Not always. The majority of people evaluated for new flashes are found to have an uncomplicated PVD, which does not threaten vision on its own. However, a meaningful portion of those evaluations do uncover a retinal tear, and a smaller number reveal a detachment. Because the stakes are high and the conditions are not distinguishable by symptoms alone, every new episode of flashing lights deserves a professional evaluation rather than a watch-and-wait approach at home.
What is the difference between flashing lights and floaters, and why do they often appear together?
Flashing lights are brief bursts or streaks of light, most often seen in the peripheral vision, that last less than a second. Floaters are dark spots, threads, or cobweb shapes that drift across the visual field and move when the eye moves. They often appear together because both are caused by the same event: the vitreous pulling away from the retina during a PVD. The floaters represent condensed clumps of vitreous gel, while the flashes are the retina’s response to being tugged. When both appear suddenly at the same time, it is important to be seen promptly.
If I had a retinal tear treated once, am I at higher risk for future tears?
Having had one retinal tear does increase your likelihood of developing additional tears, both in the same eye and in the fellow eye. This is why our team emphasizes regular monitoring even after a successful laser or cryotherapy treatment. Ongoing retinal examinations allow us to detect new tears early, before they can progress, and to track changes in the vitreous-retinal relationship over time.
Is it normal to still see flashes after a retinal tear has been treated?
Some patients do continue to notice occasional flashes for several weeks after a retinal tear is sealed, particularly if the PVD is still completing its separation. Treated tears do not reopen, but new areas of traction can develop elsewhere on the retina during the same PVD episode. If flashes increase noticeably after treatment or if new floaters or a shadow appear, that warrants a prompt call to our office rather than assuming it is residual activity from the treated area.
Still have questions about flashing lights in your eye?
If you are experiencing flashing lights , especially if they are new, sudden, or paired with floaters or a shadow in your vision , the most important step is a same-day call to a fellowship-trained retina specialist. Our team at Atlantic Retina Center focuses exclusively on the retina, vitreous, and macula, and we serve patients across the Eastern Shore of Maryland and central and southern Delaware from multiple office locations. Call us at 410-742-4100 to schedule your retinal evaluation and get the answers you need.