Why Do You See Flashes of Light?

12 November 2026

Have you ever seen small flashes, bright lights, or lightning-like streaks, even when there is no light source in front of you? Although they can occur for different reasons, these changes in vision should not be ignored, especially if they appear suddenly.

What causes flashes of light?

Inside the eye, there is a gel-like substance called the vitreous, which fills much of the eyeball and is in contact with the retina. Over time, this substance can change in consistency and separate from the retina. During this process, it may pull on the retina, causing you to see flashes of light.

They can also occur for other reasons, such as migraines with aura, blows to the eyes, or certain retinal conditions.

Although some flashes are associated with age-related changes, it is important to determine their cause through an eye examination.

When can they be a warning sign?

Flashes of light require special attention when they appear suddenly or become more frequent. In some cases, they may indicate a retinal tear or detachment, conditions that can seriously threaten vision.

Watch for flashes accompanied by:

• The sudden appearance of many spots or floaters.
• A dark shadow or the sensation of a curtain covering part of your vision.
• Blurred vision or sudden vision loss.
• A significant increase in flashes of light.

If you experience any of these symptoms, seek emergency eye care. Do not wait for them to go away on their own.

How can the causes be identified?

An ophthalmologist can perform a dilated eye examination to look at the retina and check for tears, detachment, or other abnormalities.

Treatment will depend on the cause. Some changes in the vitreous only require monitoring, while a retinal tear or detachment may require urgent specialist care.

Do not ignore changes in your vision

Flashes of light may seem like a temporary nuisance, but in certain circumstances, they are a sign that something is happening inside the eye.

Paying attention to these changes and seeing an ophthalmologist promptly is essential to protecting your eye health.

At Instituto Espaillat Cabral, you can schedule an eye examination and receive professional guidance about any changes in your vision.

If you notice new or sudden flashes of light, seek medical attention without delay. Schedule your appointment here.