Always consult your Laser Safety Officer (LSO) or another qualified laser safety professional when selecting laser safety eyewear. Required wavelength protection and optical density (OD) depend on the specific laser and reasonably foreseeable worst-case exposure conditions. Do not select laser safety eyewear based on laser color, lens color, or wattage alone.
The color of a laser safety lens does not tell you which laser it protects against.
For example, you should not assume:
Green laser = green glasses
Red laser = red glasses
In fact, laser safety eyewear often appears a very different color from the laser wavelength it is designed to attenuate.
The correct eyewear should be selected based primarily on the laser wavelength and required optical density (OD).
Why Are Laser Safety Glasses Different Colors?
Laser safety filters are designed to attenuate particular ranges of wavelengths while allowing other wavelengths to pass through.
Depending on the filter technology, this can cause the lens to appear:
Clear
Amber
Orange
Red
Green
Blue
Another color or tint
That visible lens color is a consequence of the filter's spectral transmission characteristics. It is not, by itself, the specification you should use to select laser protection.
Two lenses that look similar can provide very different laser protection.
Likewise, two lenses that look completely different may both provide protection at a particular wavelength.
Start With the Laser Wavelength
Before selecting laser safety glasses, determine the actual operating wavelength or wavelengths of the laser.
For example:
A green laser may commonly operate around 532 nm
An Nd:YAG laser may operate around 1064 nm
A fiber laser may operate around 1060–1080 nm
Many CO₂ lasers operate around 10,600 nm
However, the laser type or visible color should not be used as a substitute for checking the manufacturer's actual wavelength specification.
The eyewear's specified protection range must include the wavelength or wavelengths that need to be attenuated.
Then Determine the Required Optical Density
Matching the wavelength is only the first step.
The eyewear must also provide sufficient optical density (OD) at that wavelength.
Optical density describes the amount by which the filter attenuates laser radiation.
For example:
OD 3 transmits approximately 1/1,000 of the incident radiation.
OD 6 transmits approximately 1/1,000,000 of the incident radiation.
However, this does not mean you should simply select the highest OD available.
The required OD should be determined from the laser hazard evaluation based on the reasonably foreseeable worst-case exposure conditions.
What About the Color of the Laser?
Visible laser color can provide a rough indication of wavelength, but it is not precise enough for selecting laser safety eyewear.
A person might describe several different wavelengths as “green,” “red,” or “blue.”
Laser safety eyewear specifications, by contrast, define wavelength protection numerically in nanometers (nm) or other wavelength units.
So instead of asking:
“What glasses do I need for a green laser?”
the better question is:
“What is the laser's wavelength, and what OD is required at that wavelength?”
What About Invisible Lasers?
Lens color becomes an even clearer example of why wavelength matters when dealing with invisible lasers.
Common industrial lasers may operate at wavelengths such as 1064 nm, 1070 nm, or 10,600 nm, none of which can be seen by the human eye.
The eyewear may still have a visible tint—or in some cases may appear relatively clear—while providing attenuation at an invisible wavelength.
You cannot determine laser protection by looking at the lens.
Always use the manufacturer's wavelength and OD specifications.
Does Darker Mean More Protection?
No.
A darker-looking lens does not necessarily provide greater laser protection.
A very dark lens could provide little or no protection at a particular laser wavelength, while a much lighter lens could provide substantial attenuation at that wavelength.
Visible light transmission and laser optical density are related to different aspects of filter performance.
This is why laser eyewear should never be selected simply by comparing which lens looks darkest.
What Information Do I Need?
Before selecting laser safety eyewear, identify:
Laser wavelength(s)
Required optical density at those wavelengths
Operating mode and relevant laser parameters
Reasonably foreseeable worst-case exposure conditions
Other considerations such as visible light transmission, fit, coverage, prescription compatibility, and the type of work being performed can then help determine which appropriate filter/frame combination is best for the user.
The Bottom Line
Do not select laser safety glasses by color.
The color of the laser does not determine the color of the protective lens, and the visible appearance of a lens does not tell you whether it provides adequate protection.
Instead, start with:
Laser wavelength → Required OD → Appropriate filter → Frame and fit
The laser safety eyewear should provide appropriate attenuation at the actual laser wavelength and sufficient OD for the reasonably foreseeable worst-case exposure conditions.