Chemical Burns of the Eye

Overview

A chemical burn of the eye happens when a corrosive or irritating substance contacts the eye's surface, damaging the cornea, the conjunctiva, and sometimes deeper structures. This is a medical emergency. The single most important action is to begin flushing the eye with clean water or saline immediately and continuously, even before arranging transport to medical care, because every minute of contact causes more damage.

Alkali (basic) chemicals, such as oven and drain cleaners, lime, plaster, cement, and ammonia, are especially dangerous because they penetrate the eye quickly and keep causing harm. Acids and irritants can also injure the eye. Prompt flushing and emergency assessment can be the difference between full recovery and lasting vision loss.

The reason immediate flushing matters so much is that the chemical keeps damaging tissue for as long as it remains in contact with the eye. Washing it out quickly and thoroughly stops the injury from getting worse and is more important than any other single step, more important even than rushing straight to hospital without flushing first. Mild splashes of everyday irritants often cause only temporary stinging and redness, but it is not always possible to tell at the moment of injury how serious a burn will be, which is why every chemical eye exposure should be flushed at once and then checked.

Symptoms

Symptoms appear right after exposure and may include:

• Severe eye pain, stinging, or burning
• Redness and watering
• A feeling of something in the eye
• Blurred vision
• Difficulty keeping the eye open
• Swelling of the eyelids
• In severe alkali burns, a paradoxically white or pale eye where blood vessels are damaged

The lack of pain or a white-looking eye after a strong alkali splash does not mean the injury is mild; it can signal severe damage and still needs emergency care.

Causes

Chemical eye burns result from contact with harmful substances, often at home or work:

• Alkalis: Drain and oven cleaners, ammonia, lime, plaster, cement, and fertilizers. These are the most damaging because they penetrate deeply.
• Acids: Battery acid, certain cleaners, and pool chemicals. These tend to cause more surface damage.
• Irritants: Many household sprays, solvents, and detergents.

Splashes, sprays, rubbing the eye with contaminated hands, and workplace accidents are common ways exposure happens.

Risk Factors

• Working with industrial or cleaning chemicals
• Construction work involving cement, lime, or plaster
• Not wearing eye protection during chemical handling
• Home cleaning and DIY projects without precautions
• Young children's access to household chemicals

Diagnosis

After immediate flushing, an emergency clinician or eye specialist assesses the injury. They may:

• Check the eye's pH to confirm the chemical has been washed out, continuing irrigation until it normalizes
• Examine the cornea and conjunctiva with a slit lamp and fluorescein dye
• Assess vision and eye pressure
• Grade the burn's severity to guide treatment and follow-up

Knowing what the chemical was, how concentrated it was, and how long it was in contact with the eye helps the clinician judge how serious the burn is likely to be, so it is useful to bring the product container or a photo of the label if it can be done safely. Checking and rechecking the eye's pH is a simple but important step, because irrigation must continue until the eye is no longer acidic or alkaline. The eye may be examined more than once over the following hours and days, as the full extent of a chemical burn is not always apparent at first.

Treatment & First Aid

First aid is the priority and should start immediately:

• Flush the eye continuously with clean water or saline for at least 15 to 20 minutes, holding the eyelids open.
• Remove contact lenses if you can do so easily while flushing.
• Do not try to neutralize the chemical with another substance.
• Seek emergency care right away, ideally continuing to flush on the way.

In the hospital, treatment may include further irrigation, antibiotic and lubricating drops, medication to control inflammation and eye pressure, and pain relief. Mild burns often heal within days with drops and follow-up. Severe burns, particularly from strong alkalis, are managed by an eye specialist and may need prolonged treatment and surgery to help the surface heal, sometimes over weeks or months. Recovery and the final effect on vision depend heavily on how strong the chemical was and how quickly and thoroughly the eye was flushed at the scene, which is why first aid is so decisive in the outcome.

Prevention

• Wear protective goggles or a face shield when handling chemicals
• Store household and industrial chemicals safely and out of reach of children
• Read labels and follow safety instructions
• Know where eyewash stations are at work
• Never mix cleaning products, which can release harmful fumes

When to See a Doctor

A chemical eye burn is always an emergency. After flushing the eye immediately, seek emergency care for any chemical exposure to the eye, even if it seems mild. Call emergency services or go to the nearest emergency department, especially if you have:

• Severe pain, marked redness, or swelling
• Blurred or lost vision
• A white or pale-looking eye after an alkali splash
• Exposure to a strong cleaner, lime, cement, or ammonia

Do not delay flushing to make a phone call; begin irrigation first, then get help.

Related Topics

Frequently Asked Questions

References

1. American Academy of Ophthalmology. Chemical Eye Burns.
2. National Eye Institute (NEI). Eye Injuries.
3. MedlinePlus, U.S. National Library of Medicine. Chemical burn or reaction.
4. American Association of Poison Control Centers.