What is the difference between serious eye damage and eye irritation?

They are the two categories of one GHS hazard class, separated by reversibility. Serious eye damage (Category 1) is tissue damage or vision decay that is NOT fully reversible within 21 days — effectively permanent — and carries the GHS05 corrosion pictogram with the signal word 'Danger.' Eye irritation (Category 2) is fully reversible within 21 days (subcategory 2A) or within 7 days (the mild 2B subcategory) and carries the GHS07 exclamation-mark pictogram with 'Warning.'

Which pictogram is used for serious eye damage?

Serious eye damage (Category 1) uses the GHS05 corrosion pictogram — the same symbol used for skin corrosion and corrosivity to metals — reflecting that it can cause permanent, corrosive-type injury to the eye. Eye irritation (Category 2) instead uses the GHS07 exclamation-mark pictogram. This is why a corrosion pictogram on a label may signal an eye hazard even when the product is not being used near the skin.

Does an extreme pH automatically mean serious eye damage?

A chemical with an extreme pH (2 or below, or 11.5 or above) is often classified for serious eye damage based on that pH alone, unless data show otherwise, because strong acids and bases can cause irreversible eye injury. In addition, any chemical classified as skin-corrosive (Category 1) is automatically treated as causing serious eye damage. Buffering capacity (acid/alkaline reserve) can refine the assessment, but extreme pH is a strong default indicator.

GHS / HazCom term · Glossary

Serious Eye Damage / Eye Irritation

Verified vs OSHA sources · 2026-10-05

A GHS/HazCom health hazard class (Appendix A.3 of 29 CFR 1910.1200) covering effects on the eye from a chemical. It is split by reversibility: Category 1 (serious eye damage) is the production of tissue damage or serious physical decay of vision that is NOT fully reversible within about 21 days; Category 2 (eye irritation) is a reversible change that fully resolves within 21 days, with subcategory 2A (irritating) and 2B (mildly irritating, reversible within 7 days). Category 1 uses the corrosion pictogram (GHS05); Category 2 uses the exclamation-mark pictogram (GHS07).

29 CFR 1910.1200 App A.329 CFR 1910.1200

Also known as: eye irritation, eye damage, serious eye damage/eye irritation

Serious Eye Damage / Eye Irritation at a glance

Defined in 29 CFR 1910.1200 Appendix A.3; the dividing line is reversibility within ~21 days.
Category 1 — Serious eye damage: irreversible (not fully reversed within 21 days). Pictogram GHS05 (corrosion), signal word 'Danger.'
Category 2A — Eye irritation: reversible within 21 days. Pictogram GHS07 (exclamation mark), signal word 'Warning.'
Category 2B — Mild eye irritation: reversible within 7 days (a US-recognized subcategory).
Strong acids/bases (pH ≤ 2 or ≥ 11.5) are often classified for serious eye damage based on extreme pH.
A chemical classified as skin-corrosive (Category 1) is automatically considered to cause serious eye damage.
Eye protection selection and emergency eyewash provisions flow from this classification.

In plain English

How badly a chemical hurts the eyes. If the damage is permanent or doesn't heal within about three weeks, it's Category 1 — 'serious eye damage,' and it gets the corrosion symbol. If the eyes recover within 21 days it's Category 2 'eye irritation' (2A), or within 7 days it's the mild 2B — and it gets the exclamation-mark symbol. The dividing line is simple: does the eye recover, and how fast?

What the rule says

“Serious eye damage refers to the production of tissue damage in the eye, or serious physical decay of vision, which is not fully reversible, occurring after exposure of the eye to a substance or mixture. Eye irritation refers to the production of changes in the eye, which are fully reversible, occurring after exposure of the eye to a substance or mixture.”
29 CFR 1910.1200 App A.3.1.1

In context

A classification or labeling concept from the UN Globally Harmonized System, adopted into US law through OSHA's Hazard Communication Standard (29 CFR 1910.1200) and its appendices.

29 CFR 1910.1200

Where this is written in OSHA's rules

29 CFR 1910.1200 App A.3Read on eCFR / OSHA.gov
29 CFR 1910.1200Read on eCFR / OSHA.gov

Example

A degreaser with a pH of 12.5 is evaluated for eye effects. Because of its extreme alkalinity — and because materials that are corrosive to skin are presumed to cause serious eye damage — it is classified as Category 1, serious eye damage. Its label carries the GHS05 corrosion pictogram, the signal word 'Danger,' and the hazard statement 'Causes serious eye damage,' and its SDS specifies chemical splash goggles and immediate 15-minute eyewash flushing. A milder surfactant that produces redness clearing within a week would instead be Category 2B with the GHS07 pictogram and 'Warning.'

Why it matters

Eye injuries are among the most common and preventable serious workplace injuries, and the difference between reversible irritation and permanent blindness is exactly what this classification communicates. Getting the category right drives eye-protection selection (safety glasses vs. chemical splash goggles vs. face shield), emergency eyewash requirements, and first-aid instructions. Treating a Category 1 serious-eye-damage chemical as mere irritation can lead to inadequate protection and permanent vision loss.

Serious eye damage (Cat 1) vs. eye irritation (Cat 2) — reversibility is the key

The two categories are one GHS hazard class split by whether the eye recovers. CATEGORY 1, 'serious eye damage,' means the injury is NOT fully reversible within 21 days — effectively permanent damage or lasting vision loss — and it carries the corrosion pictogram (GHS05) and 'Danger.' CATEGORY 2, 'eye irritation,' means the effect fully reverses within 21 days (2A) or within 7 days for the mild 2B subcategory, and it carries the exclamation-mark pictogram (GHS07) and 'Warning.' Because they share a hazard class but differ sharply in consequence, always check the category, not just the phrase 'eye hazard.'

Serious Eye Damage / Eye Irritation Categories (App A.3)

Category	Effect / Reversibility	Pictogram / Signal
1 — Serious eye damage	Irreversible; not fully reversed within 21 days	GHS05 (corrosion) / Danger
2A — Eye irritation	Reversible within 21 days	GHS07 (exclamation) / Warning
2B — Mild eye irritation	Reversible within 7 days	GHS07 (exclamation) / Warning

Serious Eye Damage / Eye Irritation: frequently asked questions

What is the difference between serious eye damage and eye irritation?: They are the two categories of one GHS hazard class, separated by reversibility. Serious eye damage (Category 1) is tissue damage or vision decay that is NOT fully reversible within 21 days — effectively permanent — and carries the GHS05 corrosion pictogram with the signal word 'Danger.' Eye irritation (Category 2) is fully reversible within 21 days (subcategory 2A) or within 7 days (the mild 2B subcategory) and carries the GHS07 exclamation-mark pictogram with 'Warning.'
Which pictogram is used for serious eye damage?: Serious eye damage (Category 1) uses the GHS05 corrosion pictogram — the same symbol used for skin corrosion and corrosivity to metals — reflecting that it can cause permanent, corrosive-type injury to the eye. Eye irritation (Category 2) instead uses the GHS07 exclamation-mark pictogram. This is why a corrosion pictogram on a label may signal an eye hazard even when the product is not being used near the skin.
Does an extreme pH automatically mean serious eye damage?: A chemical with an extreme pH (2 or below, or 11.5 or above) is often classified for serious eye damage based on that pH alone, unless data show otherwise, because strong acids and bases can cause irreversible eye injury. In addition, any chemical classified as skin-corrosive (Category 1) is automatically treated as causing serious eye damage. Buffering capacity (acid/alkaline reserve) can refine the assessment, but extreme pH is a strong default indicator.

Free tools for this

GHS Label Generator PPE Selector by GHS Pictogram

Governing OSHA standards

OSHA Hazard Communication Standard (HazCom)

More GHS terms

Acute Toxicity

A GHS health-hazard class for the harmful effects that follow a single dose, several doses within 24 hours, or a 4-hour inhalation exposure. Chemicals are sorted into categories by route (oral, dermal, inhalation) using LD50/LC50 cut-offs — Category 1 is the most toxic. OSHA's HazCom standard uses Categories 1–4.

Aspiration Hazard

A GHS health-hazard class for chemicals that can be fatal if swallowed and then enter the airways — directly or by vomiting — causing chemical pneumonia or lung injury. Thin, low-viscosity hydrocarbons (gasoline, kerosene, lamp oil) are the classic example. It is Category 1, with the health-hazard pictogram (GHS08) and signal word “Danger.”

Carcinogenicity

A GHS health-hazard class for chemicals that cause cancer or increase its incidence. GHS (and OSHA's HazCom standard) sorts carcinogens into Category 1A (known human carcinogen), 1B (presumed, from animal evidence), and Category 2 (suspected). Carcinogens carry the health-hazard pictogram (GHS08) and a hazard statement such as H350 (“May cause cancer”).

Chemicals Under Pressure

A physical-hazard class added by OSHA's 2024 HCS update (aligning with GHS Revision 7) for liquids or solids pressurized with a gas, held in pressure receptacles other than aerosol dispensers and not classified as gases under pressure. It is categorized by the flammability of its contents and always carries the gas-cylinder pictogram (GHS04) for the pressure hazard.

Classification

The process of evaluating the available scientific evidence for a chemical against the GHS criteria to decide whether it is hazardous and, if so, the hazard class and category of each effect. Classification is the first step in HazCom — its result determines every label element (pictogram, signal word, hazard and precautionary statements) and SDS content.

Corrosive to Metals

A GHS physical-hazard class for chemicals that, by chemical action, will materially damage or even destroy metals. It is a single category (Category 1), determined by corrosion-rate testing on steel and aluminum, and uses the corrosion pictogram (GHS05) with the hazard statement H290. It is a separate hazard from skin corrosion, even though both use GHS05.

Desensitized Explosives

A physical-hazard class added by OSHA's 2024 HCS update (GHS Revision 7) for solid or liquid explosives that have been phlegmatized — wetted or diluted — to suppress their explosive properties for safe transport and storage. It has four categories based on the corrected burning rate, and uses the flame pictogram (GHS02), not the exploding-bomb.

Globally Harmonized System (GHS)

An internationally agreed framework created by the United Nations (first adopted in 2003) that standardizes how chemical hazards are classified and communicated — using common hazard classes, pictograms, signal words (Danger / Warning), and coded hazard (H) and precautionary (P) statements on labels and safety data sheets. The US adopted GHS into law through OSHA's 2012 Hazard Communication Standard update.

Sources & verification

Reviewed by HazComFast against eCFR, OSHA.gov, NIOSH, and the Federal Register. Last reviewed 2026-10-05. This glossary is general information, not legal advice; OSHA State-Plan states (e.g. California, Michigan) may adopt stricter requirements.

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