Right fit. Better protection.

EN 166 is moving on. So should your eye protection.

On 11 November 2025, the long established EN 166 standard was replaced by EN ISO 16321. The update reflects how workplace risks have evolved and introduces a globally harmonised approach to safety eyewear testing and marking.

By moving from a European EN standard to an ISO standard, EN ISO 16321 creates greater consistency across international markets while setting clear minimum performance requirements for modern eye protection.

Why this matters for buyers and wearers:

• Clearer, more consistent product markings
• Improved relevance to real-world hazards
• A stronger focus on wearer protection and usability

One of the most important changes in EN ISO 16321 is its increased focus on fit.

The standard now assesses orbital protection zones, measuring how much of the eye, eye socket and surrounding facial area is protected. Testing is carried out across multiple head sizes and at different impact speeds.

Because people are different

EN ISO 16321 uses six different head forms, designed to represent around 95% of the global population. This recognises a simple truth, eyewear that fits one person well may not protect another in the same way.

A well-fitted frame can:

• Improve comfort for prolonged wear
• Reduce movement, slippage and distraction
• Support consistent, everyday use
• Help improve compliance on site
• Contribute to safer working environments

Designed and manufactured in Germany, uvex safety eyewear combines ergonomic frame designs with advanced lens technologies to deliver reliable performance throughout the working day.

Every detail is developed with real wearers in mind, helping to support comfort, fit and long-term compliance in demanding environments.

What makes uvex different?

• Permanent anti fog and scratch-resistant lens coatings
• Unique dual coating technology, anti-fog on the inside, scratch resistant on the outside
• UV400 protection as standard across the entire uvex range
• Ergonomic frame designs to support a secure, stable fit

Selecting safety eyewear that fits properly is no longer optional. Under EN ISO 16321, fit plays a direct role in protection, comfort and compliance.

Explore the uvex safety eyewear range and help ensure your workforce is properly protected for every task.