Flashes of light in vision

Overview

Flashes of light in vision are brief streaks or sparkles of light that you see, often in the corner of your eye. They usually happen when the jelly-like substance inside your eye (the vitreous) pulls on or rubs against the light-sensitive layer at the back of your eye (the retina).

Yes, flashes of light become more common as you get older, especially after age 50. Many people experience them at some point.

It affects people of all ages but is more common in older adults, people who are very nearsighted (myopic), those with a family history of retinal detachment, and people who have had eye surgery or an eye injury.

Symptoms

Common symptoms

• Seeing brief, lightning-like streaks or sparks in one eye, often in low light or when you move your eyes.
• Flashes that come and go, usually lasting a second or two each time.
• Flashes may be more noticeable when you look from side to side.

Symptoms in children

• Less common, but may occur with migraine headaches (often with a blind spot or zigzag lines).
• Can also result from an eye injury or a blow to the head.

Symptoms in older adults

• Typical flashes from a posterior vitreous detachment (PVD), which is the jelly pulling away from the retina as part of aging.
• Flashes often accompanied by a single large floater that looks like a ring or cobweb.

Causes

Main causes

• Posterior vitreous detachment (PVD) – the normal shrinking and pulling away of the vitreous jelly from the retina, common with aging.
• Retinal tear or detachment – a serious condition where the vitreous pulls hard enough to tear the retina or separate it from the back of the eye.
• Ocular migraine (migraine with aura) – a type of headache that can cause flashing lights, zigzag patterns, or temporary vision loss in both eyes.
• Inflammation inside the eye (uveitis) – can cause floaters and light sensitivity.
• Eye injury or recent eye surgery.

Risk factors

• Age over 50.
• Being very nearsighted (high myopia).
• Previous eye surgery, especially cataract removal.
• A family history of retinal detachment.
• Having had a retinal tear or detachment in one eye (higher risk in the other eye).
• Eye injury or trauma.

When to see a doctor

See a doctor urgently if:

• If you suddenly see a lot more flashes than usual, especially with new floaters or a shadow in your vision, you should see an eye doctor the same day.
• If you have sudden vision loss or a curtain-like dark area, call your local emergency number immediately.

Book a routine appointment if:

• Mild, occasional flashes that have been present for a while and are not changing, it is still a good idea to have an eye exam to check your retina, but it is not an emergency.
• If you have never had flashes before but they are infrequent and not getting worse, schedule a routine appointment with your optometrist or GP.

Diagnosis

Your eye doctor will ask about your symptoms, when they started, and whether you have any risk factors. They will then examine your eyes using special instruments after widening your pupils with eye drops.

Tests that may be done

• Visual acuity test – reading letters on a chart to check how clearly you see.
• Dilated eye exam – drops to widen your pupils so the doctor can see the retina and vitreous with a bright light and magnifying lens (ophthalmoscopy).
• Slit-lamp exam – a microscope with a light to look at the front and inside of your eye.
• Sometimes an ultrasound (B-scan) of the eye if the view is blocked by bleeding or a cataract.

What to expect at your appointment

The exam is not painful, but the drops may make your vision blurry and your eyes sensitive to light for a few hours. You might need someone to drive you home. The doctor will explain what they found and whether you need treatment or follow-up.

Treatment

Treatment depends entirely on the cause of the flashes. If the retina is healthy and there is no tear or detachment, you usually do not need any treatment – just keep an eye on your symptoms. If a retinal tear is found, prompt treatment can prevent it from becoming a detachment. If a detachment has occurred, surgery is often needed urgently.

Self-care at home

• If your flashes are from a migraine, rest in a dark, quiet room until the episode passes.
• Avoid rubbing your eyes, as this can sometimes make symptoms worse.
• Keep a note of when flashes occur and tell your doctor if the pattern changes.

Medical treatments

For a retinal tear, doctors can seal it with a laser (photocoagulation) or with freezing treatment (cryotherapy). These are done in the clinic or as an outpatient procedure. If a retinal detachment is present, surgery is required – this may involve a gas bubble injection, a flexible band around the eye (scleral buckle), or removing the vitreous jelly (vitrectomy). Your eye doctor will discuss which option is best for your situation.

When is surgery considered?

Surgery is needed when a retinal detachment occurs. It is usually done as an emergency to try to preserve your vision. The type of surgery depends on the size and location of the detachment. Most people recover well, but vision improvement can take weeks to months.

Living with this condition

If you have been diagnosed with a harmless cause like normal vitreous detachment, you can continue with your daily activities. Just be aware of any new or worsening symptoms. Wear sunglasses if light bothers you after a dilated exam.

Lifestyle tips

• If you have had a retinal tear treated, avoid strenuous exercise, heavy lifting, or activities that involve jarring head movements for a few weeks as advised by your doctor.
• If you had surgery with a gas bubble, you may need to keep your head in a certain position for a period – follow your surgeon's instructions carefully.

Diet and exercise

A balanced diet rich in vegetables, fruits, and omega-3 fatty acids supports overall eye health. No specific diet prevents flashes or retinal detachment. Gentle exercise is fine, but avoid contact sports or activities that could hit the head if you are at risk.

Mental health and emotional wellbeing

Worrying about vision loss is natural. Some people feel anxious or afraid, especially if they have had a retinal tear. It is okay to ask for support. Talk to your doctor if anxiety affects your daily life.

Prevention

Most causes of flashes, especially posterior vitreous detachment, cannot be prevented because it is a normal part of aging. However, if you have risk factors like high myopia, having regular eye exams can help detect problems early. If you have had a retinal tear in one eye, your doctor may monitor the other eye more often.

Screening programmes

There is no routine screening for flashes in the general population. However, people with risk factors (e.g., high myopia, family history of retinal detachment) may benefit from periodic dilated eye exams. Ask your eye doctor how often you should be seen.

Complications

If left untreated

• If a retinal tear is not treated, it can progress to a retinal detachment, which can lead to permanent vision loss in that eye.
• A retinal detachment that is not repaired can cause total blindness in the affected eye.

Long-term outlook

The outlook is generally good if the cause is harmless, like normal aging changes. When a retinal tear or detachment is caught and treated promptly, most people regain useful vision. Even after surgery, many people see well enough for everyday activities. Your eye doctor will give you a realistic idea of what to expect based on your specific situation.

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