Laser Safety Glasses Buying Guide: Wavelength & OD Explained

Choosing laser safety glasses is not like choosing sunglasses. The wrong pair can look identical to the right one while providing close to zero protection, because laser eyewear is filtered to specific wavelengths, not general brightness. This guide covers the two numbers that matter most, wavelength and Optical Density (OD), plus the certification standards you should look for when buying laser safety equipment in New Zealand or Australia.

Why wavelength matters most

Every laser emits light at a specific wavelength, measured in nanometres (nm). A pair of laser safety glasses is manufactured to block a specific wavelength range, not light in general. Eyewear rated for a 1064nm Nd:YAG fiber laser can provide almost no protection against a 532nm green laser, even though the lenses might look similarly dark. Before buying eyewear, confirm the exact wavelength (or wavelengths) your laser emits, usually printed on the laser's specification plate or its user manual.

What is Optical Density (OD)?

Optical Density is a logarithmic measure of how much a lens attenuates light at its rated wavelength. Each whole OD number blocks ten times more light than the one before it, so OD6 blocks 100 times more light than OD4, and OD8 blocks 10,000 times more than OD4. Higher OD is not automatically better: too high an OD can cut so much visible light that you can't clearly see your own work area, while too low an OD at the right wavelength will not fully protect your eyes. As a general rule:

• OD4 to OD5: lower-power visible lasers (pointers, some medical/aesthetic devices)
• OD5 to OD6: most Class 3B and entry-level Class 4 lasers, including many IPL and diode systems
• OD7 to OD8+: high-power industrial fiber, Nd:YAG and CO2 lasers used in cutting and welding

Always match OD to your laser's actual output power, not just its class. When in doubt, our team can confirm the right OD from your laser's spec sheet, get in touch here.

Wavelength guide by laser type

This table is a starting reference only. Always confirm the exact wavelength and power of your specific device before purchasing eyewear.

Understanding the standards

CE EN207 is the European standard for laser eye protection, specifying the wavelength range and OD a lens must achieve. It is the standard to look for on any laser (not IPL) safety glasses.

ISO 12609 is the standard specific to IPL (Intense Pulsed Light) devices, which emit broadband, non-coherent light rather than a single laser wavelength. IPL eyewear should carry ISO 12609 rather than EN207.

EN12254 covers laser safety screens, meaning windows, enclosures and curtains used to contain a laser within a defined work area. See our range of certified laser safety windows, enclosures and curtains.

Common mistakes to avoid

• Assuming eyewear from one laser is safe for another, even if the lens colour looks the same
• Buying eyewear rated for the laser class but not the specific wavelength
• Using standard sunglasses or safety glasses instead of certified laser eyewear
• Sharing one pair of glasses across a room with multiple different laser types
• Forgetting patient or bystander eyewear in clinics running IPL or laser treatments

Quick answers

What OD rating do I need for laser safety glasses? It depends on your laser's wavelength and maximum output power, not just its class. Most industrial fiber and CO2 lasers need OD7 or higher; many lower-power medical and aesthetic devices are adequately covered from OD4 to OD6. Check your laser's spec sheet or ask us directly.

How do I choose laser safety eyewear? Start with your laser's exact wavelength, then match eyewear rated for that wavelength at a sufficient OD for the device's output power. Confirm the eyewear carries EN207 (laser) or ISO 12609 (IPL) certification.

What are the laser safety requirements in New Zealand and Australia? In both countries, lasers are classified under AS/NZS IEC 60825.1, and Class 3B and Class 4 devices are treated as higher-risk sources that require active control measures. In New Zealand, workplace laser safety sits under the Health and Safety at Work Act 2015 and its regulations; lasers are non-ionising radiation and are not covered by the Radiation Safety Act 2016, which applies to ionising radiation only. In Australia, Class 3B and Class 4 lasers are regulated under state and territory Work Health and Safety (WHS) laws, which require operators to be trained in safe use, with additional guidance from ARPANSA. Always confirm the current requirements with WorkSafe NZ or your relevant Australian state WHS regulator for your specific setup.

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Not sure which filter matches your laser? Send us the wavelength and power of your instrument and our specialists will match the exact eyewear, window or enclosure. Browse the full range: laser safety glasses, welding helmets, containment, and laser safety courses.