Sudden Flashes or New Floaters? Don't Wait.

Floaters are small clumps of collagen fibers or cells floating inside the vitreous humor, the clear, gel-like substance that fills the inside of your eye. What you see are actually shadows these clumps cast on your retina.

• Tiny black or gray dots
• Squiggly lines or threads
• Cobweb-like shapes
• Ring-shaped shadows

Floaters drift when you move your eyes and tend to dart away when you try to look directly at them. They are most noticeable against bright, uniform backgrounds like a white wall or blue sky.

Flashes occur when the vitreous gel tugs on or stimulates the retina. The retina responds by sending a signal to your brain that your brain interprets as a burst of light, even though no light actually entered the eye.

• Lightning streaks or arcs in your peripheral (side) vision
• Brief, camera-flash-like bursts
• Flickering or sparkling lights

Flashes from vitreous traction typically last a fraction of a second and appear at the edge of your vision. Zigzag shimmering lines that last 15 to 30 minutes are more likely a migraine aura, which is a different condition. If you are unsure which you are experiencing, call us and we will help you determine the next step.

No. Most floaters are harmless and result from normal age-related changes to the vitreous. However, the pattern of onset matters:

• Gradual appearance of a few small floaters over months or years is usually benign
• Sudden onset of many new floaters, especially with flashes, can indicate a retinal tear or vitreous hemorrhage

Because you cannot tell the difference on your own, any new or sudden change in floaters warrants a prompt dilated eye exam.

A posterior vitreous detachment (PVD) occurs when the vitreous gel naturally shrinks and separates from the surface of the retina. This is the most common cause of new flashes and floaters.

• Increasingly common after age 50, and very common by the 60s and 70s
• Usually harmless on its own and does not require treatment
• The ring-shaped floater many patients notice (called a Weiss ring) is the detached vitreous where it was previously attached around the optic nerve

Because PVD can cause a retinal tear as the vitreous separates. If the vitreous is firmly attached to a particular spot on the retina, the pulling force during separation can create a hole or tear.

• Retinal tears occur in a meaningful percentage of PVD cases
• A tear can progress to a retinal detachment if not treated promptly
• Only a dilated eye exam can determine whether a tear has formed

This is why the AAO recommends an urgent dilated exam for all new-onset PVD symptoms, even though the majority turn out to be uncomplicated.

The vitreous separation process can take several weeks to months to fully complete. During this time:

• Flashes may come and go, often more noticeable in dim lighting or at night
• Floaters are typically most prominent in the first few weeks and gradually become less noticeable
• The AAO recommends a follow-up dilated exam approximately 4 to 6 weeks after the initial episode to confirm no new tears have developed

If at any point during this period you notice a significant increase in floaters, new or more frequent flashes, or any shadow or curtain effect, call immediately for re-evaluation. A new tear can form even weeks after the initial PVD event.

A retinal tear is a break in the thin layer of tissue (the retina) that lines the back of your eye. Once a tear forms, fluid from inside the eye can seep underneath the retina and begin to lift it away from the underlying tissue.

• A tear that is caught early can usually be sealed with a quick, in-office laser or freezing procedure
• A tear that progresses to a full retinal detachment typically requires surgery
• Prompt treatment of tears has a high success rate for preventing detachment

• A sudden shower of new floaters (not just one or two)
• Flashes of light in your peripheral vision, often more noticeable in dim lighting
• A very subtle darkening or shadow at the far edge of your vision

A retinal tear itself is usually painless. The absence of pain does not mean the condition is less urgent. Many patients delay care because they do not feel discomfort. If you have the symptoms above, the only way to confirm or rule out a tear is a dilated exam.

No. Retinal tears do not heal on their own. Without treatment, a retinal tear has a significant risk of progressing to a retinal detachment, which is far more serious and complex to treat.

• When caught early, retinal tears are typically treated with a brief, in-office procedure (laser photocoagulation or cryopexy)
• These procedures create a seal around the tear that prevents fluid from getting underneath the retina
• Treatment is usually completed in minutes and recovery is straightforward

A retinal detachment occurs when the retina lifts away from its normal position at the back of the eye. Once detached, the retina is separated from the tissue that nourishes it, and the light-sensitive cells begin to die.

• A dark curtain, shadow, or veil that appears to spread from the periphery toward the center of your vision
• Often described as a "shade being pulled down" or "gray curtain closing in"

This is a surgical emergency. If you experience a curtain or shadow in your vision, go to the nearest emergency room or call 911 immediately.

Retinal detachment requires surgery. The specific approach depends on the type and severity:

• Pneumatic retinopexy - a gas bubble is injected into the eye to push the retina back into place, often combined with laser or cryotherapy
• Scleral buckle - a silicone band is placed around the outside of the eye to gently push the wall of the eye inward toward the detached retina
• Vitrectomy - the vitreous gel is removed and replaced with a gas bubble or silicone oil to flatten the retina back into position

Recovery time varies by procedure. Some surgeries require specific head positioning for days to weeks. Your surgeon will explain what to expect based on your specific situation. The sooner surgery is performed, the better the chances of preserving vision.

Outcomes depend heavily on how quickly the detachment is treated and whether the macula (the central vision area) is still attached:

• Macula-on detachment (central vision still intact): better visual outcomes when surgery happens promptly
• Macula-off detachment (central vision already affected): vision can often be improved, but full recovery to pre-detachment levels is less likely

This is why the urgency cannot be overstated. Every hour matters once a curtain or shadow appears in your vision.

• Dilating drops are placed in your eyes to widen the pupils, allowing your doctor to see the entire retina
• The drops take approximately 20 to 30 minutes to take full effect
• Your doctor will use a slit-lamp biomicroscope and a specialized lens to examine the retina in detail, including the far periphery where most tears occur
• Indirect ophthalmoscopy may also be used, where your doctor wears a headlamp and uses a handheld lens to get a wide view of the retina

The exam is not painful. You may experience:

• Mild stinging for a few seconds when the dilating drops are applied
• Light sensitivity and blurred near vision for 4 to 6 hours after dilation
• Brief, bright light during the examination (your doctor needs strong illumination to see the retina clearly)

• Bring sunglasses for your drive home
• Arrange for someone else to drive you if possible, as near vision will be blurry
• You will be able to return to normal activities (other than driving) the same day

Depending on your specific findings, your doctor may use additional diagnostic tools:

• Optical coherence tomography (OCT) provides a detailed cross-section of the retina's layers, helpful for detecting subtle fluid or traction
• Widefield retinal imaging captures a high-resolution photograph of the retina, creating a permanent record for comparison at follow-up visits
• B-scan ultrasound may be used if there is bleeding inside the eye (vitreous hemorrhage) that prevents your doctor from seeing the retina directly

Retinal tears are typically sealed using one of two in-office procedures:

• A focused laser creates small burns around the tear, forming scar tissue that welds the retina to the underlying tissue
• Performed in the office with topical anesthesia (numbing drops)
• Takes approximately 10 to 20 minutes
• You may see brief flashes of light during the procedure

• A freezing probe is applied to the outside of the eye over the area of the tear
• Creates a similar adhesive scar to seal the tear
• May be used when the tear is in a location that is difficult to reach with a laser

Both procedures are highly effective at preventing a tear from progressing to a detachment when performed promptly.

If your dilated exam shows a PVD without a retinal tear, no procedure is needed. However:

• A follow-up dilated exam is recommended in approximately 4 to 6 weeks to confirm no delayed tear has developed
• You should monitor for any worsening of symptoms (more floaters, new flashes, shadow in vision) and call immediately if they occur
• The floaters from a PVD typically become less noticeable over weeks to months as your brain adapts

For patients with persistent, large floaters that significantly impact daily life (reading, driving, working at a computer), two options exist:

• A specialized laser is used to break up large floaters into smaller, less noticeable pieces
• Performed in the office
• Not appropriate for all types of floaters; your doctor will determine if you are a candidate

• Surgical removal of the vitreous gel (and the floaters within it)
• Highly effective but carries surgical risks, including cataract formation and, rarely, retinal detachment
• Generally reserved for cases where floaters are severely debilitating

Most patients find that their floaters become significantly less noticeable over time as the brain learns to filter them out. We recommend a conservative, watch-and-wait approach for most cases.

Several factors increase your risk:

• Nearsighted (myopic) patients - elongated eyes have thinner retinas that are more vulnerable to tears
• Age over 50 - PVD becomes increasingly common, creating the conditions for tears
• Prior cataract surgery - the vitreous structure changes after lens removal, increasing detachment risk
• Family history of retinal detachment - genetic factors affect retinal and vitreous structure
• Previous retinal tear or detachment in either eye
• History of significant eye trauma

Yes. Patients with diabetic retinopathy can develop floaters from a different mechanism:

• Abnormal blood vessels in the retina can leak blood into the vitreous (vitreous hemorrhage)
• This may appear as a sudden cloud of dark red or black floaters, or a generalized haziness
• Vitreous hemorrhage from diabetic retinopathy can also be accompanied by tractional forces that pull on the retina

If you have diabetes and notice new floaters or any change in your vision, call us for an urgent evaluation. Diabetic vitreous hemorrhage may require additional treatment beyond what is needed for a standard PVD.

LASIK reshapes the cornea and does not directly affect the retina or vitreous. However, many LASIK patients are nearsighted, which is itself a risk factor for retinal tears and detachment.

• LASIK corrects your refractive error but does not change the elongated shape of a myopic eye
• Your underlying retinal risk remains the same as it was before LASIK

If you had LASIK and develop new flashes or floaters, you should be evaluated with the same urgency as any other patient.

Floaters from a PVD typically do not disappear entirely, but they do become significantly less noticeable over time:

• Most patients report major improvement within 3 to 6 months
• Your brain gradually adapts and learns to filter out the shadows, a process called neuroadaptation
• Floaters may also physically settle lower in the eye, moving out of your central line of sight

While waiting for adaptation, some patients find it helpful to adjust lighting (avoiding bright, uniform backgrounds) and to shift their gaze briefly when a floater is distracting.

Even after a normal initial exam, you should call us immediately if you notice:

• A sudden increase in the number of floaters
• New or more frequent flashes of light
• A shadow, curtain, or dark area in any part of your vision
• A noticeable decline in your overall vision

We typically schedule a follow-up dilated exam 4 to 6 weeks after the initial visit to make sure no new tears have developed during the PVD process. After that, annual dilated eye exams are recommended, especially for patients in higher-risk groups.

There is no proven way to prevent PVD or age-related floaters, as they are a normal part of aging. However, you can take steps to protect your retinal health and reduce the risk of complications:

• Wear protective eyewear during sports, yard work, and home improvement projects
• Manage systemic conditions like diabetes and high blood pressure that can affect retinal blood vessels
• Keep regular annual eye exam appointments, especially if you are over 50 or have risk factors
• Know the warning signs (sudden floaters, flashes, curtain/shadow) so you can act quickly if they occur

The single most important thing you can do is seek prompt evaluation whenever new symptoms arise. Early detection of retinal tears is the most effective way to prevent vision loss.