Most eye floaters and flashes come from normal, age-related changes in the gel inside the eye. But a sudden burst of new floaters, new flashes, or a shadow or curtain across your vision can signal a retinal tear or detachment, which is an emergency. About 8% to 22% of people with a sudden vitreous detachment already have a tear. Call an eye doctor the same day, because only a dilated exam can tell the difference.
It usually happens at an ordinary moment. You’re scrolling on your phone or merging onto the 5 when a cluster of new dark specks drifts across one eye, maybe with a flicker of light at the edge of your vision. Sudden eye floaters and flashes like these leave many people wondering whether to wait it out or call someone right now.
Here’s the short answer. Many floaters are a normal part of getting older, but a sudden change is different. New floaters, new flashes, or a shadow over part of your vision can be signs of a retinal tear or detachment, and the National Eye Institute considers retinal detachment a medical emergency.
At Anaheim Eye Institute, we’ve cared for Orange County patients since 1958, and we would much rather see you for a false alarm than too late. Below, we cover causes, warning signs, retinal tear risk, migraine look-alikes, and what happens at an urgent eye exam.
Safety notice: If you have a sudden shower of new floaters, new flashes of light, or a shadow or curtain over part of your vision, contact an eye doctor today. If it’s after hours or you can’t be seen promptly, go to an emergency room. If sudden vision loss comes with weakness, numbness, or trouble speaking, call 911.
What Causes Eye Floaters and Flashes?
Quick take: Most floaters come from normal aging of the vitreous, the clear gel that fills the inside of the eye. As the gel shrinks and pulls away from the retina, a change called posterior vitreous detachment (PVD), people often notice floaters, and the tugging can cause brief flashes of light.
Tiny clumps in the vitreous cast shadows on the retina, the light-sensitive layer at the back of the eye, and those shadows are what you see as eye floaters. The American Academy of Ophthalmology (AAO) explains that flashes happen when the vitreous rubs or pulls on the retina. The American Society of Retina Specialists (ASRS) notes that PVD is rare before age 40.
- Floaters look like specks, threads, squiggly lines, or small cobwebs that drift as your eye moves (NEI).
- Flashes often look like brief streaks or sparks of light toward the side of your vision.
- PVD is common: StatPearls reports it in about half of people over 50.
- The other eye often develops PVD as well, usually within about a year, according to ASRS.
Warning Signs That Eye Floaters and Flashes Are an Emergency
Quick take: Contact an eye doctor the same day if floaters or flashes appear suddenly or change quickly, or if a shadow or curtain covers part of your vision. These can be signs of a retinal tear or detachment.
The NEI advises going to an eye doctor or emergency room right away for retinal detachment symptoms, since waiting raises the risk of permanent vision loss. A review in American Family Physician advises that people with new floaters, flashing lights, and a loss of part of their visual field see an ophthalmologist within 24 hours and the same day when risk factors are present.
Get care as soon as you notice:
- A sudden “shower” of many new floaters
- New flashes of light in one or both eyes
- A dark shadow or gray curtain moving over your side or central vision
- Blurry or reduced vision that comes on suddenly
- Any of these symptoms after a blow to the eye or head
What to do next:
- Monday to Friday, 8am to 5pm, call Anaheim Eye Institute at 714.533.2020
- After hours, on weekends, or if you can’t be seen promptly, go to an emergency room
- Don’t drive yourself if your vision is blurred or partly blocked
“New floaters, flashes, or a curtain over your vision deserve a same-day call, not a wait-and-see approach.”
How Often Do Sudden Floaters Mean a Retinal Tear?
Quick take: Most people with a sudden vitreous detachment do not have a retinal tear, but a meaningful minority do. Research estimates that about 8% to 22% have a tear at their first exam, which is why prompt evaluation matters.
A tear can form when the shrinking vitreous pulls hard enough on the retina to rip it. Fluid can then pass through the opening and lift the retina away from the back of the eye, causing a retinal detachment. These figures show why eye doctors take new symptoms seriously:
- About 8% to 22% of people with sudden, symptomatic PVD have a retinal tear at the first exam, according to StatPearls
- About 50% to 70% have tears when bleeding into the vitreous is also found
- About 7% to 12% have tears when no vitreous bleeding is present
- About 2% of people with PVD and no tear at first develop one in the following weeks, per AAO clinical guidelines
- At least half of untreated, symptomatic horseshoe-shaped tears with ongoing pulling go on to cause a detachment
That 2% figure is one reason your eye doctor may schedule a follow-up visit even when the first exam looks clear.
Who Has a Higher Risk of Retinal Tears and Detachment?
Quick take: Anyone can develop a retinal tear, but some factors increase the risk. These include significant nearsightedness, previous cataract or other eye surgery, eye injury, and a personal or family history of retinal detachment.
The ASRS says there is no way to predict exactly who will develop a retinal tear. Knowing your risk factors can help you act quickly. The AAO and the NEI list these common ones:
- Moderate to high nearsightedness (myopia)
- Previous cataract surgery or other eye surgery
- A serious eye injury
- A retinal tear or detachment in the other eye
- A family history of retinal detachment
- Lattice degeneration, thin or weak areas of the retina found in about 6% to 8% of people
- Older age and diabetic retinopathy
Having a risk factor doesn’t mean you will develop a tear, but it makes a prompt call about new symptoms even more worthwhile.
Ocular Migraine or Retinal Problem? Key Differences
Quick take: Migraine visual auras often look like shimmering zigzag lines that spread and fade within about 20 to 30 minutes, while retinal flashes tend to be brief flickers that come and go, sometimes with new floaters. Because the two can overlap, new symptoms still need an exam.
The AAO describes a migraine without headache, sometimes called an ophthalmic migraine, as jagged lines or wavy patterns lasting up to about 20 minutes. In an Ask an Ophthalmologist answer, the AAO adds that migraine flashes usually last up to 30 minutes and appear in both eyes, while lights from a retinal tear come and go with no set length of time.
- Migraine aura look: a zigzag or shimmering pattern that starts small, expands, and fades
- Migraine aura location: seen in the vision of both eyes, with or without a headache
- Retinal flash look: brief flickers or streaks, often at the edge of vision in one eye
- Retinal flash pattern: may repeat with eye movement or arrive with new floaters or a shadow
These patterns do not rule out any serious problems. A first-ever aura, flashes in only one eye, or flashes with new floaters all deserve a prompt exam. If sudden vision loss comes with weakness, numbness, or trouble speaking, call 911.
“Only a dilated eye exam can tell a harmless floater from a retinal tear.”
What to Expect at an Urgent Exam for Eye Floaters and Flashes
Quick take: An eye doctor dilates your pupils and examines the whole retina, including its far edges, to check for tears or detachment. Many tears can be treated in the office, and follow-up visits help catch new problems early.
Imaging such as ultra-wide field retinal photos or OCT scans can add detail, but for sudden symptoms the dilated exam remains the standard. Dilation blurs vision and brings light sensitivity, so bring sunglasses and plan for someone else to drive.
Possible outcomes include:
- PVD without a tear: usually no treatment, and ASRS notes symptoms typically fade over several weeks
- Retinal tear: often sealed in the office with laser or a freezing treatment (cryotherapy)
- Retinal detachment: requires surgery, such as pneumatic retinopexy, vitrectomy, or scleral buckle
- Follow-up: ASRS recommends one or more checkups within 3 months of PVD onset
The NEI notes that detachment treatment is successful for most people, especially when caught early. Retina care at Anaheim Eye Institute includes laser treatment for retinal tears and surgery for retinal detachment.
For floaters that linger and disrupt daily life, the NEI mentions vitrectomy as an option. The AAO cautions that this surgery has risks and is seldom necessary.
Protect Your Vision: Don’t Wait on Sudden Changes
Most eye floaters are a normal part of aging, but what matters most is change. A sudden shower of floaters, new flashes, or a shadow over your vision calls for a same-day exam, because retinal problems are best treated early.
For sudden symptoms, call us during business hours, or go to the nearest emergency room after hours or if you can’t be seen promptly. For ongoing floaters or routine concerns, a comprehensive eye exam is a good place to start.
Have questions about your vision or are you ready to explore your options? The team at Anaheim Eye Institute has been helping Orange County patients see clearly since 1958.
Book an Appointment or call 714.533.2020.
Medical disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. It cannot determine the cause of your symptoms. If you have sudden changes in your vision, contact an eye doctor or go to an emergency room right away.
Frequently Asked Questions
Are eye floaters an emergency?
Most floaters are not an emergency and are due to normal aging of the gel inside the eye. However, a sudden increase in floaters, especially with flashes of light or a shadow over your vision, can signal a retinal tear or detachment. Contact an eye doctor the same day if you notice these changes.
How soon should I see a doctor for new flashes of light?
Contact an eye doctor the same day you notice new flashes of light. Medical guidance calls for an ophthalmologist to evaluate new flashes and floaters within 24 hours at the latest, and a shadow, curtain, or vision loss needs care right away. If it’s after hours or you can’t be seen quickly, go to an emergency room.
Can a retinal tear heal on its own?
A retinal tear should not be expected to seal on its own. Research shows that at least half of untreated, symptomatic horseshoe tears, which have ongoing pulling from the vitreous, progress to a retinal detachment. Only a dilated eye exam can confirm a tear and guide treatment.
What does a retinal detachment look like?
People with a retinal detachment often notice a dark shadow or gray curtain moving across part of their vision. Other warning signs include many new floaters, flashes, and blurry vision. A retinal detachment is a medical emergency, so seek care from an eye doctor or emergency room right away.
Will floaters from a posterior vitreous detachment go away?
Floaters and flashes from a posterior vitreous detachment typically become less noticeable over several weeks. Your eye doctor may recommend follow-up visits to check for new tears. If floaters suddenly increase or you notice a shadow in your vision, contact your eye doctor right away.
