ANSI Z87.1 Safety Glasses Requirements: What Compliance Demands

If you buy or specify safety eyewear in the US, you are almost certainly working against ANSI/ISEA Z87.1-2020. That standard is referenced by OSHA (29 CFR 1910.133) and by most state and federal procurement rules. For readers in Great Britain, Australia, or Canada, the same standard appears in global supply chains and is often adopted by multinational employers, so knowing its mandatory clauses is practical, not academic. This article focuses on the normative requirements—what the standard demands, who is bound, and what proof you need.

Who Is Bound by ANSI Z87.1?

The standard itself is voluntary in the sense that it is not a federal law, but OSHA makes it legally binding for most US workplaces through 29 CFR 1910.133(a)(1). That regulation states that employers must ensure each affected employee uses appropriate eye or face protection when exposed to hazards. The only way to satisfy that requirement in practice is to provide eyewear that meets ANSI Z87.1-2020 or a later revision.

For manufacturers, compliance is not optional if you want to sell into the US market. Section 9.1 of the standard requires that all protective eyewear be tested and marked according to the requirements. In the UK, Australia, and Canada, the equivalent standards are different (EN 166, AS/NZS 1337, CSA Z94.3), but many multinational firms simply require ANSI Z87.1 as an internal baseline because it is stricter on impact testing than some other regimes.

Mandatory Impact and Lens Requirements

The heart of ANSI Z87.1 is the impact performance clauses. Section 7.2 (Basic Impact) and Section 7.3 (High Impact) impose specific test conditions. Basic impact requires a 1-inch steel ball to be dropped from 50 inches onto the lens; the lens must not crack, fracture, or detach. High impact goes further: a 0.25-inch steel ball is fired at 102 feet per second (about 70 mph) at the lens and frame, and no part may break free.

Lens thickness is another hard requirement. For non-prescription lenses, the minimum thickness at the thinnest point is 1.0 mm. For prescription lenses, the minimum is 2.0 mm, but if the lens is hardened to meet high-impact, the minimum can drop to 1.0 mm. These values are in Section 8.3.1 and are enforced through the lens marking system, so you can verify thickness from the marking alone.

There is also a requirement on optical clarity. Section 8.2 sets a maximum prismatic power and a limit on astigmatic variation. In plain terms, the lens must not distort your vision beyond a set threshold. If you are sourcing eyewear, you should look for a 'Z87' mark on the lens; that alone tells you the basic impact and optical tests were passed.

Markings and Labels: The Evidence You Must See

Every pair of compliant eyewear must carry specific markings, as specified in Section 9.1. The lens must be marked with the manufacturer's logo and the 'Z87' designation. If the eyewear passes high impact, the marking is 'Z87+' (with a plus sign). The frame must also be marked, and if it is a prescription frame, it must show the manufacturer's mark and the 'Z87-2' designation for prescription lenses.

Markings are not decorative; they are the compliance evidence that OSHA inspectors and safety auditors look for. If a worker's glasses show 'Z87' but the frame has no marking, the eyewear is not compliant. In practice, you should reject any product that lacks the lens mark or the frame mark, because you cannot prove compliance otherwise.

For high-impact protection, the 'Z87+' mark is the only way to know the eyewear meets the more severe test. Some manufacturers also add a 'D3' mark for splash protection or 'W' for welding, but those are optional additions, not replacements for the core Z87 mark.

What Counts as Proof of Compliance

OSHA does not require you to keep a certificate of conformance for every pair of glasses, but it does require that you can demonstrate that the eyewear you supply meets the standard. The practical way to do that is to retain the manufacturer's test reports or a declaration of conformity. Section 9.2 of the standard requires the manufacturer to provide, upon request, documentation that the product was tested in accordance with the standard.

If you are an employer, you should keep a simple file for each eyewear model you issue: the product datasheet, the test report summary, and a note of the date you purchased. If an OSHA inspector asks, you can show that file. If you are a manufacturer, you must keep full test records, including high-speed video of impact tests, for at least 5 years, per the standard's recordkeeping guidance.

For importers and distributors, the burden is similar. You must be able to trace each batch back to a test report. If you cannot, you are effectively selling non-compliant product, regardless of what the label says.

Common Compliance Gaps and How to Avoid Them

Even when you buy from a reputable brand, you can run into subtle gaps. Here is a practical list of what to check before you issue or accept safety glasses:

1. Look for the 'Z87' mark on the lens itself, not just on the frame or the packaging. If the lens has no mark, it is not compliant.
2. For high-impact, confirm the 'Z87+' mark is present. A plain 'Z87' does not meet the high-impact test.
3. Verify the frame has a manufacturer's mark. Many cheap imports have a lens mark but no frame mark, which fails Section 9.1.
4. Check the lens thickness for prescription glasses: it must be at least 2.0 mm unless the lens is marked as high-impact, in which case 1.0 mm is allowed.
5. Ask your supplier for the test report and keep a copy. If they cannot provide one, that is a red flag.

One additional trap: the standard was revised in 2020, and the old 2015 version is no longer current. If your supplier is selling 'Z87-2015' product, it may not meet the 2020 clauses, especially the updated high-impact and marking requirements. Always specify 'ANSI Z87.1-2020' in your purchase orders.

Prescription and Non-Prescription Differences

Prescription safety glasses have a separate set of requirements. Section 8.3.2 covers prescription lenses, and the key difference is thickness: 2.0 mm minimum versus 1.0 mm for non-prescription. However, if the lens is made of a high-impact material (like polycarbonate) and passes the high-impact test, it can be as thin as 1.0 mm, but it must carry the 'Z87+' mark.

Another difference is that prescription lenses must be fitted by a qualified professional. The standard does not require a specific certification for the fitter, but it does require that the lenses be mounted so they do not fall out during impact. In practice, you should always buy prescription safety glasses from a licensed optician who understands the Z87 requirements, not from a general online retailer.

For readers in GB, AU, or CA, note that your local standards (EN 166, AS/NZS 1337, CSA Z94.3) have different thickness and impact rules. If you are buying for a US-based employer or for export to the US, ANSI Z87.1 is the governing document, and you must follow it strictly.

Takeaway: Compliance Is About Evidence, Not Intent

To be compliant with ANSI Z87.1-2020, you need more than just glasses that look sturdy. You need eyewear that carries the correct markings, meets the impact and thickness thresholds, and comes with documented test reports. As an employer, you must provide that eyewear and be ready to show proof. As a manufacturer or importer, you must maintain those test records. The standard is not complicated, but it is unforgiving: a missing mark or a thin lens is a direct violation.

Before you issue another pair of safety glasses, run the five-point check above. If everything passes, you are in good shape. If not, fix it now—because an OSHA citation or a workplace injury is far more expensive than a replacement pair of glasses.