Laser safety glasses protect the eyes by attenuating the energy of laser radiation before it reaches the eye. Specialised filters inside the lenses are designed to block or absorb specific laser wavelengths.

When laser light strikes the lens, part of the energy is absorbed by the filter material while another portion may be reflected away. This process reduces the intensity of the beam that reaches the eye.

The amount of attenuation is described using optical density ratings. These ratings indicate how effectively the lens reduces laser energy at a particular wavelength.

Because lasers operate at different wavelengths, protective eyewear must be selected carefully to match the specific laser system in use. The wavelength range and optical density are typically printed on the lens or frame.

Laser eyewear is commonly used alongside other safety controls such as beam enclosures and operational procedures.

Understanding these principles helps ensure laser protection is used appropriately in professional environments.