Chemical Eye Burns

Chemical eye burns occur when the eye is exposed to acids, alkalis, or other caustic substances. This is a true ocular emergency—immediate irrigation can mean the difference between full recovery and permanent blindness. Alkali burns (from lye, oven cleaner, cement, etc.) are particularly dangerous because they continue to penetrate and damage the eye.

Emergency First Aid

How to Irrigate

1. If available, use an eyewash station
2. Otherwise, use a sink, shower, hose, or water bottle
3. Position head with injured eye down (so chemical doesn't run into good eye)
4. Pour water continuously over the open eye
5. Have patient look in all directions while irrigating
6. Continue for a MINIMUM of 20-30 minutes
7. Remove any visible particulate matter if present

Types of Chemical Burns

Alkali Burns (More Dangerous)

Common Sources:

• Lye (drain cleaners)
• Ammonia (cleaning products)
• Lime and cement
• Oven cleaner
• Fireworks
• Industrial chemicals

Why They're Worse:

• Penetrate deeply into tissues (saponification)
• Continue damaging tissue even after surface exposure ends
• Can reach inside of eye (anterior chamber) rapidly
• Damage may appear less severe initially than it is

Acid Burns

Common Sources:

• Battery acid (sulfuric acid)
• Pool chemicals (muriatic acid)
• Vinegar (acetic acid)
• Rust removers
• Some cleaning products

Behavior:

• Tend to cause surface damage
• Proteins coagulate, creating a barrier
• Usually don't penetrate as deeply
• Still serious—high concentrations cause severe damage

Other Irritants

• Solvents
• Detergents
• Pepper spray
• Some cosmetics

These cause irritation but typically less severe than true acid/alkali burns.

Severity Classification

Grade I (Best Prognosis)

• No limbal ischemia (white area around cornea)
• No corneal haze (or very mild)
• Damage limited to conjunctiva

Grade II

• Some limbal ischemia (<1/3 of limbus)
• Corneal haze but iris visible

Grade III

• Significant limbal ischemia (1/3 to 1/2 of limbus)
• Total corneal haze (no iris details visible)

Grade IV (Worst Prognosis)

• Extensive limbal ischemia (>1/2 of limbus)
• Cornea opaque
• Severe damage to limbal stem cells

Symptoms

Immediate

• Severe pain (though severe burns may have less pain due to nerve damage)
• Tearing
• Redness
• Blurred vision
• Inability to open eyes (blepharospasm)
• Foreign body sensation
• Swelling of eyelids

Warning Signs of Severe Burn

• White, blanched appearance to eye surface
• Unable to see iris/pupil clearly
• Severe vision loss
• Lids swollen shut

Diagnosis

Emergency Room Evaluation

• History: What chemical? How long exposure? Irrigation done?
• Visual acuity check
• pH testing of eye (target: 7.0-7.4)
• Slit lamp examination
• Assessment of:
  • Corneal clarity
  • Limbal ischemia (blood vessel damage at cornea edge)
  • Conjunctival damage
  • Intraocular pressure (may be elevated)
  • Anterior chamber reaction

Why pH Matters

• Normal eye pH: 7.0-7.4
• Must irrigate until pH normalizes
• Continue irrigation and recheck pH 5-10 minutes after stopping
• Particularly important for alkali burns (may need prolonged irrigation)

Treatment

Acute Phase (First 1-2 Weeks)

Continued Irrigation:

• In ER: liters of saline through a lens device
• Continue until pH normal and stable

Medications:

• Topical antibiotics (prevent infection)
• Cycloplegics (reduce pain from ciliary spasm)
• Artificial tears/lubricants (frequent)
• Vitamin C drops (may help healing)
• Possibly topical steroids (carefully—can impair healing)
• Oral pain medication
• Tetanus prophylaxis if not current

Remove Retained Material:

• Sweep fornices (pockets behind lids) for particles
• Especially important with cement or powder exposures

Pressure Management:

• IOP may be elevated
• Treat with pressure-lowering drops

Intermediate Phase

• Continue lubrication
• Treat/prevent complications
• May need amniotic membrane transplant for severe cases
• Scleral lens for surface protection

Long-Term Management

Depending on severity:

• Treatment of persistent epithelial defects
• Management of scarring
• Treatment of glaucoma if developed
• Possible corneal transplant
• Limbal stem cell transplant (for severe cases)
• Lid surgery if needed

Complications

Acute

• Corneal ulceration
• Infection
• Elevated intraocular pressure
• Severe inflammation

Chronic

• Corneal scarring (opacity)
• Limbal stem cell deficiency (surface doesn't heal properly)
• Symblepharon (lids stuck to eyeball)
• Dry eye (severe)
• Glaucoma
• Cataract
• Persistent epithelial defects (cornea won't heal)
• Chronic inflammation
• Blindness

Prognosis

Factors Affecting Outcome

• Type of chemical (alkali worse than acid)
• Duration of exposure
• Speed of irrigation (most important factor you can control)
• Amount of irrigation
• Severity grade at presentation
• Limbal involvement (affects healing)

Outcomes by Grade

Grade	Prognosis
I	Usually excellent recovery
II	Good, may have some scarring
III	Fair, likely significant scarring
IV	Poor, often severe vision loss

Prevention

At Home

• Store chemicals safely, out of reach of children
• Wear safety glasses when using caustic chemicals
• Read product labels
• Never mix cleaning chemicals
• Keep chemicals in original containers

At Work

• Use required personal protective equipment
• Know location of eyewash stations
• Follow safety protocols
• Ensure adequate ventilation
• Know emergency procedures

Eyewash Stations

• Should provide 15 minutes of continuous flow
• Should be within 10-second walk
• Must be maintained and tested regularly
• Know the location before an emergency

Frequently Asked Questions

Should I neutralize the chemical with an opposite pH?

No. Do not try to neutralize. The heat generated by neutralization reactions can cause additional damage. Copious irrigation with water or saline is the correct approach.

Is milk better than water for irrigation?

No. Water is fine and usually more accessible. The priority is immediate, copious irrigation—use whatever clean water source is available. Don't waste time looking for something "better."

How long should I really irrigate?

At least 20-30 minutes for most exposures. For alkali burns, longer may be needed. pH should be checked and irrigation continued until normal. At home, irrigate as long as possible while arranging transport to ER.

My eye feels better—can I stop irrigating?

No. Continue irrigating for the full recommended time. Pain relief doesn't mean the chemical is gone. Alkali burns in particular can feel better initially while still causing deep damage.

Will I be able to see again?

This depends on the severity of the burn. Mild burns often recover completely. Severe burns can cause permanent vision loss. Early, aggressive irrigation and proper treatment give the best chance of good outcome.

What if I don't know what chemical it was?

Irrigate anyway. The treatment is the same—immediate, copious irrigation. If you have the container, bring it to the ER (safely) so they know what you were exposed to.

References