This depends on several factors such as careful treatment, proper care, and environmental factors.
Some laser safety goggles are worn-out after only one year, while others look like new after four years. A pair of laser safety goggles that are treated with care, cleaned according to instructions and used in a secure and non-changing setting will outlast a pair of laser safety goggles that are treated carelessly and perhaps even worn by several different people in a non-secure or changing environment.
Laser safety goggles that show any damage whatsoever (e.g. a damaged or scratched filter, color changes in the filter, damaged metal enforcement on the inside of the frames) should not be used. If you are in doubt, please contact our technical support for a safety inspection of your laser safety goggles.