Corneal flash burns are a burn injury on the front of your eye. They can be from UV sources like welding torches, reflected sunlight or from heat-related sources like open flames or explosions. They’re very treatable and usually heal within a few days. Quick treatment is important, as it can ease pain and prevent infections or other issues.
Advertisement
Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
Corneal flash burns are sunburn-like injuries to the corneas of your eyes. The cornea is bowl-shaped and protects the pupil and iris at the front of your eye. Because of where it is, it’s vulnerable to injuries if your eyes aren’t protected. These kinds of burns almost always affect both eyes at the same time.
Advertisement
Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
There are two key forms of corneal flash burns:
Corneal flash burns are somewhat common. Thermal burns make up the majority of corneal flash burns. But certain activities or being in certain locations can increase your risk of UV flash burns, too.
The symptoms of corneal flash burns are largely the same, no matter the type. They include:
UV-related symptoms may not start right away. It could be as little as 30 minutes or as much as 12 hours after the event that caused the burns.
Advertisement
The causes of corneal flash burns can vary depending on whether they’re from UV rays or thermal sources.
One main cause of UV corneal flash burns is reflected sunlight. This mainly happens in two settings:
UV corneal flash burns can also happen from artificial sources. Those include:
Flash fires and explosions — even small ones — can cause corneal flash burns. Some common ways this happens include:
Corneal flash burns can make your eyes more vulnerable to infections. They can also worsen and lead to conditions like recurrent corneal erosions. Fortunately, these complications are treatable and usually don’t become severe.
Similar to how repeated sunburns can raise your risk of melanoma and other skin cancers, UV rays may damage your eyes over time. This may raise your risk of melanoma on the surface of your eye (conjunctival melanoma) or other conditions
Advertisement
A healthcare provider, usually an emergency medicine or eye care specialist, can diagnose corneal flash burns by looking at your eyes, asking questions about your symptoms and recent activities, and with simple tests.
Many people with thermal corneal flash burns may also have burns on their eyelids or surrounding facial areas. If that’s the case, it can make diagnosing corneal flash burns a little easier.
There are two main tests for diagnosing corneal flash burns. It’s common for the diagnosing process to involve both. They are:
The cornea can repair itself very quickly, so most treatments for corneal flash burns focus on making it easier for your corneas to repair themselves, minimizing other symptoms and preventing complications.
Treatments include:
Advertisement
The time it takes for you to feel better after a corneal erosion can vary slightly. If you receive numbing medications on your eyes, you should feel relief from the pain within minutes. But once the numbing medication wears off, you might experience some discomfort.
However, your provider will likely guide you on using nonprescription pain medications, like NSAIDs, or prescribe medications to help manage your pain after numbing medications wear off. And the cornea repairs itself very quickly, so your pain level should decrease by the time numbing medications wear off, too.
Yes, corneal flash burns are easily preventable. There are rare cases where corneal flash burns happen because of unexpected events, but that’s usually not the case.
Steps to prevent corneal flash burns are:
Advertisement
Corneal flash burns are painful, but they heal quickly. You might experience other symptoms like blurred or cloudy vision, watery eyes and feeling pain around bright lights. But these symptoms are usually short-lived and will go away as your corneas heal.
Fortunately, your corneas can heal rapidly. Corneal flash burns almost always heal within 72 hours. And most will heal within the first day or two.
Corneal flash burns are painful, but the outlook is very good with quick treatment. Complications like infections or corneal erosions might happen, but these aren’t common, and they usually respond to treatment, too. And if you have further questions about the outlook for your specific situation, your eye care specialist or healthcare provider is the best person to tell you more.
Don’t delay getting medical attention if you have, or think you could have, a corneal flash burn. UV-related flash burns often don’t cause symptoms until hours after whatever caused them. Prompt medical care can help your current symptoms and keep them from worsening.
Thermal burns anywhere on your face or around your eyes always need medical care. Don’t try to self-treat them or delay getting treatment, as this can prolong the pain and increase the likelihood of infections or other issues in the future.
And if your provider prescribes antibiotics, take them exactly as recommended. Don’t stop taking them once you start feeling better. Taking and finishing these medications exactly as instructed is the best way to avoid the return of an infection or developing an antibiotic-resistant infection.
An emergency medicine provider can usually diagnose corneal flash burns initially. But they’ll also refer you to see an eye specialist, like an ophthalmologist. You should see that eye specialist as soon as possible. Your eye care specialist will also likely recommend one or more follow-up visits to check how your eyes are recovering and look for lingering issues. You should see them for these visits as scheduled.
After getting corneal flash burns diagnosed and treated initially, most people won’t need further emergency care. But if you notice your pain or your vision is getting worse, you should get emergency care right away.
There might also be reasons specific to your situation that you might need emergency care. Your eye care specialist or provider can tell you what signs you should watch for, and when you should get care.
A note from Cleveland Clinic
Corneal flash burns are a painful but very treatable eye issue. The best thing you can do for yourself if you might have a corneal flash burn is to get care as soon as possible. Don’t try to tough it out. Doing that can lead to an infection or additional problems. Fortunately, the cornea is a very fast-healing part of your body. If you get treatment quickly and follow your provider’s guidance, you should feel better within two or three days (or even sooner).
Last reviewed on 09/06/2023.
Learn more about the Health Library and our editorial process.