One of the most common misconceptions about laser safety eyewear is that a single pair of glasses will protect against every type of laser. In reality, laser safety glasses are designed to attenuate specific wavelengths or wavelength ranges.

For example, eyewear designed for a 1064nm fiber or Nd:YAG laser may offer little or no protection against a 532nm green laser or a 10,600nm CO₂ laser. Each filter is engineered to reduce particular wavelengths while allowing as much useful visible light as possible to pass through.

Some laser safety glasses provide protection across multiple wavelength ranges, making them suitable for workplaces that operate more than one laser system. However, users should always compare the wavelength specifications printed on the eyewear with the laser being used.

Selecting eyewear based on wavelength compatibility is one of the most important aspects of laser safety.