Every pair of laser safety glasses includes wavelength specifications that describe the laser radiation the filters are designed to attenuate.

These specifications are usually expressed in nanometres (nm) and may include multiple wavelength ranges with different Optical Density values.

For example, a product may provide OD 7 protection between 790–1080nm and OD 5 across a broader wavelength range.

Understanding how to interpret these specifications helps users compare products and determine whether they are appropriate for their laser system.