Burns to the eye are one of the genuine emergencies in first aid where every minute of delay matters, particularly for chemical burns, where the damage continues for as long as the chemical stays in contact with the eye’s surface.
Chemical Burns to the Eye
Chemical eye injuries can come from acids, alkalis, lime, ammonia, detergents, solvents and various industrial or household chemicals. Immediate irrigation is required in every case.
- If you were not the one handling the chemical, protect yourself first, since contaminating your own hands or eyes helps no one.
- Immediately irrigate the eye. Turn the patient’s head to the side so the affected eye is lower, and flush with clean running water, tilting the head back and gently opening the eyelids to ensure water reaches under both lids.
- Do not waste time searching for a specific neutralising agent before you start irrigating. Water works and is almost always immediately available.
- Continue irrigation until all particles are washed out and for a sustained period, since chemical burns keep damaging tissue for as long as any residue remains.
- Seek urgent medical assistance for any chemical eye injury, since even an eye that looks better after irrigation may have suffered deeper injury.
As a general rule, alkalis such as lime, ammonia and many cleaning products tend to penetrate deeper and cause worse injury than acids, since acids tend to be neutralised more at the surface. This does not change the first aid response, which is the same immediate, prolonged irrigation regardless of which type of chemical is involved.
Smoke in the Eyes
Smoke causes irritation and watering rather than a true burn in most cases, but it is uncomfortable and can obscure vision at exactly the moment clear vision matters most, such as during an evacuation. Instruct the patient not to rub their eyes, and irrigate with clean water, sterile eyewash or a saline solution as available.
Welder’s Flash and Snow Blindness
Both of these injuries come from ultraviolet light overwhelming the surface of the eye, whether from an electric arc during welding or from sunlight reflecting off snow, water or concrete over a prolonged period. The injury is often not felt until several hours later, which catches people off guard since there is no immediate warning during the exposure itself.
- Symptoms include significant pain, a gritty or sandy feeling in the eyes, sensitivity to light, and excessive watering.
- Rest the eyes in a dark or dimly lit environment.
- Cool compresses can help relieve discomfort.
- Seek medical assessment, particularly if pain is severe or vision does not improve within a day or so.
Prevention is straightforward and far preferable to treatment: correct welding eye protection for anyone welding or standing nearby, and proper sunglasses that block ultraviolet light for anyone exposed to intense reflected light for extended periods, whether from snow, water or bright concrete.
Why You Should Never Apply Ointments or Eye Drops Yourself After a Burn
Unless specifically directed by a medical professional, avoid applying ointments or unprescribed eye drops to a burned eye, since these can trap chemical residue against the eye’s surface or interfere with a clinician’s ability to properly assess the injury shortly afterward.
Frequently Asked Questions
What is the most important first step for a chemical eye burn?
Immediate, sustained irrigation with clean water. Do not delay to search for a specific neutralising agent.
Why does welder’s flash often not hurt until hours later?
Ultraviolet damage to the eye’s surface typically has a delayed onset of pain, so discomfort often appears well after the actual exposure occurred.
Are alkali chemical burns worse than acid burns to the eye?
Generally yes, alkalis tend to penetrate more deeply, though both require the same immediate, prolonged irrigation regardless of which is involved.
References and Last Reviewed
- American Academy of Ophthalmology, Eye Injury First Aid Guidance
- American Heart Association, Guidelines for First Aid
Jurisdiction: General first aid guidance, internationally applicable.
Last technically reviewed: September 2026
Reviewed by: EHS Guidelines Editorial Team
This article is educational and does not replace accredited first aid training or professional medical care. Seek urgent medical assessment for any chemical or heat burn to the eye.
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