CO₂ lasers operate at 10,600nm in the far-infrared region. Unlike visible or near-infrared wavelengths, this radiation is absorbed primarily by the cornea rather than reaching the retina.

Protective eyewear for CO₂ systems must specifically list 10,600nm coverage. Optical density should match system power and exposure conditions.

Because far-infrared radiation is invisible, verifying lens markings before use is critical. Filters are engineered to block this wavelength while allowing visible light transmission for safe operation.