Laser power is an important consideration when selecting laser safety glasses, but it should never be considered on its own. The wavelength, operating mode, beam characteristics and exposure conditions must also be assessed.

Higher-power lasers can produce hazardous levels of optical radiation that may cause serious eye injury from direct or reflected exposure. Laser safety eyewear is selected to reduce the amount of radiation reaching the eyes to a safer level. Optical density (OD) indicates how strongly the filter attenuates a particular wavelength.

For example, an eyewear filter with OD 5 provides significantly greater attenuation than an OD 3 filter at the specified wavelength. However, choosing the highest OD available is not automatically the correct approach. Excessive attenuation can reduce visibility and make alignment, positioning and observation more difficult.

Pulsed lasers require additional consideration because peak power can be substantially higher than average power. The laser's pulse duration, repetition rate and energy must be considered when determining suitable protection.

The correct laser safety glasses should therefore be selected from the laser's actual specifications rather than simply its advertised power rating. Checking the wavelength and relevant EN207 ratings alongside OD values helps ensure the eyewear is appropriate for the application.