What Are Eye Flashes?

Understanding the Sudden Bursts of Light in Your Vision

Have you ever seen sudden streaks, sparks, or flashes of light—like lightning bolts—out of the corner of your eye? These are known as eye flashes, and while they can be brief and harmless, they may also be a sign of something more serious happening inside the eye.

In this post, we’ll explain what eye flashes are, what causes them, and when you should see an eye doctor.

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What Are Eye Flashes?

Eye flashes, also called photopsia, are the visual sensation of seeing light when no actual light is entering the eye. People often describe them as:

• Flickering lights

• Lightning streaks

• Sparkles or arcs in the side vision

Flashes may last for just a few seconds or recur over several days or weeks.

What Causes Eye Flashes?

Eye flashes occur when something stimulates the retina, the light-sensitive layer at the back of the eye. The most common causes include:

1. Posterior Vitreous Detachment (PVD)

As we age, the gel-like substance inside the eye (called the vitreous) begins to shrink and pull away from the retina. This process, known as PVD, can cause the retina to send signals to the brain that are interpreted as flashes of light.

PVD is very common after age 50 and often comes with floaters—small dots, cobwebs, or strands in your vision.

2. Retinal Tear or Detachment

Sometimes, when the vitreous pulls away, it can tug too hard and tear the retina. If left untreated, this tear can lead to a retinal detachment, a serious condition that can cause permanent vision loss.

Flashes that increase in frequency, come with a sudden shower of floaters, or are followed by a curtain or shadow over your vision may be warning signs of a retinal tear or detachment.

3. Migraine with Aura

Some people experience visual migraines, which can cause zigzag patterns, shimmering lights, or blind spots in vision. These visual symptoms are called an aura and may or may not be followed by a headache.

Migraine-related flashes typically affect both eyes and last 10–30 minutes.

When Should You Worry About Eye Flashes?

While occasional flashes can be a natural part of aging, you should see an eye doctor right away if you experience:

• A sudden increase in flashes or floaters

• A dark curtain or shadow across part of your vision

• Loss of peripheral (side) vision

• Flashes after eye trauma or injury

These could be signs of a retinal tear or detachment, which requires urgent treatment to prevent permanent vision loss.

How Are Eye Flashes Diagnosed?

At South Bay Retina, we use advanced imaging and diagnostic tools to examine the retina in detail. A comprehensive dilated eye exam is typically the first step, and further tests like Optical Coherence Tomography (OCT) or ultrasound imaging may be used if needed.

Final Thoughts

Eye flashes can be harmless—or they can signal a serious retinal problem. The key is not to ignore them. If you're experiencing new or worsening flashes, especially with other vision changes, schedule an eye exam as soon as possible.

Your vision is too important to take chances.

Need to see an eye specialist? At South Bay Retina, Dr. Keshav Narain and our team are here to protect your vision using the latest technology and personalized care. Call us today to schedule an appointment. Watch the Video's Here:

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