Wiktor Wise
Seeing flashing lights in your eyes can be alarming, but it is usually not a condition on its own and tends to be a symptom of another condition. These flashes are visual disturbances that occur because of something happening in your eyes or your brain. The medical term for flashing lights that occur without a light source is photopsia. While photopsias can be harmless, they can sometimes be a sign of a more serious medical condition, such as retinal detachment, a stroke, or high blood pressure. It is always recommended to seek medical advice if you are experiencing sudden changes in your vision.
| Characteristics | Values |
|---|---|
| Name for light flashing when not looking at light | Photopsia |
| Visual disturbances | Floaters and flashes |
| Flashes | Visual disturbances occurring due to something happening in the eyes or brain |
| Phosphenes | Flashes of light with no actual light source |
| Shapes | Zigzag lines, streaks of lightning, sparks or flickering lights, spots or thick lines |
| Colors | White, yellow, or colored |
| Frequency | Higher in the morning than later in the day |
| Occurrence | In dark rooms or outside in the dark |
| Causes | Aging, extreme near-sightedness, previous eye surgery, retinal detachment, migraine disorders, high blood pressure, multiple sclerosis, macular degeneration, retinal tear, stroke, optic neuritis |
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What You'll Learn
Retinal detachment
Other causes of retinal detachment include eye injuries, which can be prevented by wearing protective eyewear during risky activities such as sports. Certain eye diseases, such as retinoschisis (separation of the retina into two layers) and lattice degeneration (thinning of the retina), can also increase the risk of retinal detachment. Diabetic retinopathy, for example, is a common cause of vision loss in working-age adults and can lead to irreversible blindness if left untreated.
The symptoms of retinal detachment often appear suddenly and may include flashing lights, streaks of lightning, or stars in the field of vision. These flashes are usually white or yellow and are more noticeable in a dark room. Other symptoms include blurred vision, dark spots, and vision changes that worsen over time. It is important to seek immediate medical attention if you experience any of these symptoms, as early treatment can help prevent permanent vision loss.
To diagnose retinal detachment, an eye doctor will perform a dilated eye exam, using eye drops to widen the pupil and examine the retina at the back of the eye. In some cases, additional tests such as ultrasound or optical coherence tomography (OCT) scans may be necessary to determine the exact position of the retina. Treatment options for retinal detachment include laser surgery, freezing treatment, and other surgical procedures, depending on the severity and location of the detachment.
In summary, retinal detachment is a serious condition that requires prompt medical attention to prevent vision loss. It is often caused by ageing, eye injuries, or underlying eye diseases. Symptoms include flashing lights, blurred vision, and dark spots, and treatment options include various surgical procedures to reattach the retina.
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High blood pressure
Flashing lights in the eyes, or photopsia, can be a symptom of high blood pressure. These flashes are visual disturbances that occur because of something happening in your eyes or your brain. Phosphenes is the medical name for flashes of light that don't happen because of actual light sources. They might also happen when you're in a dark room or outside in the dark, and they may occur with head, eye, or body movement. The flashes of light you may see are most likely to be white or sparkly, but coloured lights can also appear.
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Ageing
Flashes of light in the corner of one's eye or peripheral vision, also known as photopsia, can be caused by ageing. As people age, the vitreous gel in their eyes may start to thicken or shrink, forming clumps or strands inside the eye. This process is called posterior vitreous detachment (PVD). The vitreous gel is a clear jelly-like fluid that takes up a large part of the back of the eye, protecting the retina and helping the eye maintain its shape. When the gel changes consistency, it separates from the retina, and if it is still adhered to the retina during this separation, problems can occur. This is more likely to happen where the gel is more firmly attached, for instance, at the peripheral (side) retina.
The retina is a thin, light-sensitive tissue that transmits electrical signals to the brain via the optic nerve. It processes the focused light that comes in through the pupil and allows the brain to convert this information into a picture. When the vitreous gel rubs or pulls on the retina, it can cause flashes of light. These flashes can take many shapes, including zigzag lines, streaks of lightning, sparks, or flickering lights. They can be white, yellow, or coloured, and they may be more noticeable in a dark room.
Flashes of light can also be caused by other factors, such as retinal tears or retinal detachment, which can lead to permanent vision loss if left untreated. Repeated flashes in the form of bright spots, streaks of lightning, or shooting stars in the corner of the eye can indicate a retinal tear or detachment, and it is important to seek medical attention immediately if these symptoms occur. Other signs of retinal tears or detachment include a sudden increase in floaters, a curtain in front of the eye, a loss of peripheral vision, or a narrowing of the visual field.
While ageing is a common cause of flashes of light in the eye, it is important to note that other conditions can also contribute to this phenomenon. These include migraine disorders, high blood pressure, multiple sclerosis, and macular degeneration. Additionally, certain medications may also cause light flashes or floaters in the eyes. Therefore, it is always advisable to consult a healthcare professional if one experiences sudden changes in their vision, including flashes of light, to ensure proper diagnosis and treatment.
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Retinal tears
The vitreous is a clear, gel-like substance that fills the back cavity of the eye and is lined by the retina. When the vitreous separates from the retina, it can pull abnormally, causing the retina to tear. This abnormal vitreo-retinal adhesion is more likely to occur in people with a "sticky" vitreous. While retinal tears can also result from eye trauma, most occur spontaneously due to posterior vitreous detachment (PVD).
While flashes of light can be a symptom of retinal tears, they can also be caused by various other factors or conditions. These include posterior vitreous detachment, multiple sclerosis (MS), macular degeneration, high blood pressure, and certain medications. Flashes of light can also be a warning sign of a transient ischemic attack (TIA) or ministroke, which can lead to sudden vision loss. Therefore, it is essential to consult a healthcare professional for a thorough examination and timely diagnosis.
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Medication
While medication is not a common cause of sudden flashes of light, it has been known to occur in some cases. For instance, certain drugs can increase the risk of retinal detachment, which is characterized by flashing lights, streaks of lightning, or stars in one's line of sight. These include glaucoma medication that reduces the size of the pupil, such as Pilocar (pilocarpine). Eye surgery, such as cataract removal or a glaucoma drainage procedure, can also increase the risk of retinal detachment.
Additionally, some medications have been associated with light flashes or visual disturbances. For example, Digoxin, a heart medication, has been known to cause flickering and flashing of lights in some individuals. Anti-malaria drugs, such as chloroquine (chloroquinoline) and hydroxychloroquine (Plaquenil), can also lead to similar visual disturbances.
It is important to note that if you experience sudden flashes of light, especially if they are persistent or accompanied by other symptoms, you should seek medical attention. An ophthalmologist or eye care professional can perform a clinical exam to identify the underlying cause and advise appropriate treatment or management.
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Frequently asked questions
Sudden flashes of light are called photopsia. They are visual disturbances that occur because of something happening in your eyes or brain.
Photopsia is caused by changes in the retina, which is the light-sensitive tissue at the back of the eye that transmits electrical signals to the brain via the optic nerve. When the vitreous gel tugs and creates friction on the retina, it can cause flashes of light. This is called posterior vitreous detachment and usually happens as people age.
Photopsia is typically harmless, but it can be a symptom of another condition. If you experience repeated flashes in the form of bright spots, streaks of lightning, or shooting stars, it could indicate a retinal tear or detachment, which can lead to permanent vision loss. Other symptoms to look out for include blurred vision, dark spots, double vision, and vision changes that worsen over time. Seek immediate medical attention if you experience any of these symptoms.
