Safety Glasses Marked 3 and 4: What Do They Mean?

In demanding industrial environments, eye protection cannot be generic.
The choice of safety glasses
must take into account the specific risks present in the workplace, such as exposure to liquids, solid particles and mechanical impact.

Among the most important technical specifications are the 3 and 4 markings provided for in EN 166 and the new EN ISO 16321, which indicate levels of protection against splashing liquids and larger particles. Understanding the meaning of these classifications is essential to ensuring adequate protection in line with the requirements of each working environment.

👉 In this context, a special campaign is currently running on some models in the OMNIS range, with exclusive price conditions until March 16, 2026, making it possible to reinforce eye protection with certified solutions that are competitively adjusted to real risks.

OMNIS safety glasses: All In one

What do the markings 3 and 4 on safety glasses mean?

These markings identify additional levels of protection on safety glasses for specific risks.

Marking 3 - Protection against drops and splashes of liquids

Indicates that the safety glasses offer protection against liquid projections. It is especially relevant in:

  • Laboratories
  • Chemical industry
  • Industrial cleaning operations
  • Environments at risk of accidental splashes

Marking 4 - Protection against coarse dust particles

This marking certifies that the model protects against larger solid particles. It is recommended on:

  • Industrial maintenance work
  • Cutting or sanding processes
  • Environments with visible dust

When these two markings are combined, safety glasses offer enhanced protection against liquid and solid hazards.
Selecting safety glasses with this rating is essential when the risk of impact is not just residual.

When do you need safety glasses marked 3, 4?

These levels of protection become particularly relevant when:

  • There is a combined risk of splashes and solid particles
  • Risk assessment requires more than basic protection

In these cases, opting for a model with appropriate certification guarantees regulatory compliance and effective protection for employees.

OMNIS: The Right Choice for Combined Impact and Splash Risks

Combining anti-fog technology, anti-scratch treatment and availability in two sizes for better facial adaptation, the safety glasses combine reinforced safety with comfort and stability in everyday use.

A versatile solution for companies that need robust eye protection that meets the technical requirements of the sector.

The OMNIS Pegaso safety glasses match:

  • Marking 3 – protection against drops and splashes

  • Marking 4 – protection against coarse particles

  • Impact resistance C (EN ISO 16321)

  • High-performance anti-fog technology andanti-scratch treatment

  • Available in two sizes, including a Small version for better facial adaptation

This combination makes Omnis safety glasses particularly suitable for demanding industrial environments where eye protection must be enhanced without compromising comfort and stability.

OMNIS Technologies

Privilege: The latest anti-fog and anti-scratch technology
Designed for the most demanding environments, PRIVILEGE redefines eye protection standards. With anti-fog technology that surpasses the standard and state-of-the-art anti-scratch resistance, it ensures superior performance, longer lens life and clear vision even in demanding conditions.

Indoor and outdoor environment
Optimizes contrast
Filters blue light

CX+ Filter: Advanced Visual Enhancement and Eye Fatigue Reduction Technology
The CX+ filter improves contrast and depth perception and is designed to adapt to indoor and outdoor environments. It also incorporates blue light filtering, helping to reduce eye fatigue and improve visual comfort throughout the day.

ErgoFlex: Performance and Comfort
Ergo Flex flat stem technology facilitates the perfect fit to helmets, shell hearing protectors and breathing masks, maximizing performance and comfort throughout the working day.

OMNIS: 5 Solutions for Different Industrial Contexts

The OMNIS range is available in 5 different configurations, developed to meet different technical eye protection requirements in industrial, laboratory and technical contexts.

OMNIS Clear
Suitable for indoor environments and places with controlled lighting, this version ensures high light transmission and distortion-free vision, and is suitable for precision tasks that require rigorous visual detail.

OMNIS Solar
Integra sunscreen with UV protection, recommended for outdoor work or environments with high exposure to solar radiation. Helps reduce glare and improve visual comfort in bright conditions.

OMNIS Copper
Equipped with a filter that improves contrast and depth perception, this version is suitable for contexts where chromatic differentiation and the reading of signs are crucial, such as inspection or technical control operations.

OMNIS Clear with Stems or Elastic Band
Allows configuration with traditional stems or adjustable elastic band, ensuring greater stability and adaptation to different user profiles and operational requirements.

OMNIS Clear with Elastic Band
Version designed for applications requiring reinforced fixation and continuous stability. The adjustable elastic band provides better retention during frequent movements or dynamic operations.

OMNIS Special Campaign

Exclusive Conditions until March 16, 2026

Thinking about the needs of companies and the importance of ensuring continuous protection in a professional context, we have selected two models from the OMNIS range with special price conditions, designed to reinforce your team’s eye protection.

If you want to reinforce stocks or equip new employees, this may be the right time to do so with more advantageous conditions.

Omnis 205.01

Only 5,75€ +VAT

Safety glasses
OMNIS Clear 205.01

  • Protection against high-speed particle impact.
  • PRIVILEGE anti-fog and anti-scratch technology.
  • EN ISO 16321 certification.
  • Ergoflex temples, non-slip nose rest and lightweight structure.
  • Elastic band available as an accessory.

Omnis 205.04

Only 9,45€ +VAT

Safety glasses
OMNIS Clear 205.04

  • Protection against liquids and dust with integrated interior foam.
  • Configuration with rods or elastic band.
  • PRIVILEGE anti-fog and anti-scratch technology.
  • EN ISO 16321 certification.

Request Information or Technical Support

For more information on Omnis safety glasses, available versions or support in choosing the most suitable solution, please contact us.

We are available to answer any questions.