What Causes Flashes of Light in the Eyes? Warning Signs You Should Not Ignore
Seeing flashes of light in the eyes, such as flash-like light, lightning-like streaks, or sparkling lights when there is no actual light in front of you, is a symptom that many people may have experienced. It often occurs when moving the eyes, staying in a dark environment, or after prolonged eye use.
Sometimes, this symptom may be temporary and not serious. However, in some cases, flashes of light in the eyes may be a warning sign of an internal eye abnormality, especially problems related to the vitreous humor and retina. If left untreated, it may affect long-term vision.
What Are Flashes of Light in the Eyes?
Flashes of light in the eyes, medically known as photopsia, are a condition in which a person sees light even though no actual light is entering the eye. They may appear as camera-like flashes, lightning streaks, lines of light, sparks, or flickering lights within the visual field.
This symptom may occur in one eye or both eyes. If it occurs in only one eye, it often requires caution because it may be related to an abnormality inside the eyeball, such as the vitreous pulling on the retina. However, if it occurs in both eyes at the same time, it may also be associated with migraine, the nervous system, or other physical factors.
What Do Flashes of Light in the Eyes Feel Like?
People who experience flashes of light in the eyes may describe the symptoms in different ways, such as:
- Seeing sudden flashes of light, similar to a camera flash.
- Seeing lightning-like light or sparks near the outer corner of the eye.
- Seeing flickering lights that appear intermittently.
- Seeing lines of light, bright spots, or zigzag lights within the visual field.
- Symptoms that become more noticeable when moving the eyes, rolling the eyes, or staying in a dark environment.Having floaters, dark spots, floating lines, or cobweb-like shadows in the vision together with the flashes.
If the symptoms occur only briefly and there are no other abnormal signs, they may not always indicate a serious condition. However, if the flashes are new, occur more frequently, or are accompanied by blurred vision, it is recommended to have an eye examination for safety.
What Causes Flashes of Light in the Eyes?
1. Vitreous Degeneration or Vitreous Traction on the Retina
One possible cause is a change in the vitreous humor. As we age, the vitreous, a gel-like substance inside the eyeball, gradually shrinks or degenerates. If the vitreous pulls on the retina, it may stimulate the eye and create the sensation of seeing flashes of light.
2. Retinal Tear
If the vitreous pulls too strongly on the retina, it may cause a tear in the retina. Patients often experience flashes of light together with a sudden increase in floaters, dark spots, or floating lines. This condition is very important because it may lead to retinal detachment.
3. Retinal Detachment
Retinal detachment is an eye emergency. Patients may see flashes of light, many dark spots, reduced vision, or a dark shadow that looks like a curtain covering part of the vision. This condition often does not cause eye pain, which may lead some people to overlook it. However, if left untreated for too long, it may increase the risk of permanent vision loss.
4. Ocular Migraine or Migraine with Visual Symptoms
Some people may see shimmering lights, zigzag lines, or flickering lights before a migraine headache begins. In some cases, visual symptoms may occur without a headache. Migraine-related visual symptoms usually affect vision in both eyes and may gradually expand or move across the visual field before improving.
5. Eye Trauma or Pressure on the Eye
Rubbing the eyes forcefully, being hit around the eye area, or experiencing an accident may cause temporary flashes of light. This is because pressure or impact can directly stimulate the retina. If the injury is severe, or if there is blurred vision, an increase in floaters, or eye pain, medical attention should be sought immediately.
6. Inflammation or Disease Inside the Eye
Inflammation inside the eye, infection, or certain diseases affecting the retina and vitreous may also cause flashes of light. Other symptoms may occur together, such as red eyes, eye pain, blurred vision, or sensitivity to light.
How Are Eye-Related Flashes Different from Migraine-Related Flashes?
| Symptom Characteristics | May Be Related to the Vitreous or Retina | May Be Related to Migraine |
| Affected eye | Usually more noticeable in one eye | Usually affects the visual field of both eyes |
| Associated symptoms | Floaters, floating lines, a dark curtain over the vision, or blurred vision | Headache, nausea, light sensitivity, or warning symptoms before the headache begins |
| Urgency | An eye examination should be done promptly, especially if the symptoms are new or worsening | Medical attention is recommended if it has never happened before, becomes more frequent, or occurs with neurological symptoms |
Who Should Be Extra Cautious?
- People over 40 years old.
- Elderly individuals.
- People with severe nearsightedness.
- People who have had eye surgery, such as cataract surgery.
- People who have experienced an eye injury or trauma.
- Patients with diabetes or high blood pressure.
- People with a history of retinal disease.
- People with a family history of retinal detachment.
What Symptoms Require Urgent Attention from an Ophthalmologist?
You should see an ophthalmologist immediately if you experience any of the following symptoms:
- Sudden onset of flashes of light.
- Flashes that become more frequent or more intense.
- A significant increase in floaters, dark spots, dark lines, or cobweb-like shadows in the vision.
- Seeing something like a dark curtain, dark shadow, or dark band blocking the vision.
- Reduced vision, blurred vision, or unclear vision.
- Loss of side vision.
- Symptoms that occur after an accident or impact to the eye.
These symptoms may be related to a retinal tear or retinal detachment, which should be examined and treated as soon as possible.
How Does an Ophthalmologist Examine Flashes of Light in the Eyes?
When you visit an ophthalmologist, the doctor may perform different examinations depending on what is appropriate for your symptoms, such as:
- Taking a medical history, such as when the symptoms started, whether they occur in one eye or both eyes, and whether there are floaters or blurred vision together with the flashes.
- Checking visual acuity.
- Measuring eye pressure.
- Applying dilating eye drops to examine the retina.
- Examining the vitreous and retina using specialized ophthalmic instruments.
- Taking retinal images.
- Performing an eye ultrasound in cases where the retina cannot be seen clearly.
Treatment Options for Flashes of Light in the Eyes
Treatment depends on the underlying cause of the symptoms. You should not buy or use eye drops on your own without knowing the cause, because flashes of light in the eyes are not always caused by the surface of the eye or dry eye.
If Caused by Age-Related Vitreous Changes
If there is no retinal tear, the doctor may recommend monitoring the symptoms and scheduling follow-up appointments. In some cases, flashes of light may gradually decrease once the vitreous stops pulling on the retina.
If a Retinal Tear Is Found
If Retinal Detachment Is Present
Urgent treatment is required. Treatment may include surgery or other methods, depending on the location and severity of the condition.
If Related to Migraine
Frequently Asked Questions About Flashes of Light in the Eyes
Can Seeing Flashes of Light Without Eye Pain Be Dangerous?
Can Flashes of Light in the Eyes Go Away on Their Own?
What Causes Flashes of Light Together with Floaters?
This may be related to vitreous degeneration, vitreous traction on the retina, or a retinal tear. If the floaters increase rapidly or the flashes occur frequently, you should see a doctor as soon as possible.
Are Zigzag Lights Before a Headache a Sign of Migraine?
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