The issue of light protection is highly valued by the international community. Various international organizations, including the World Health organization, the International organization for Standardization, the International Radiation Protection Association, the American Radiological Health Service, the American National Standards Institute, and the European Committee for Electrotechnical Standardization, have all promulgated laser protection standards. At present, the EU EN207 laser protection standard is more commonly used in the world.
According to the American laser safety standard (ANSI Z136.1) and the European laser safety standard (EN207/EN208), there are several situations where you need to wear laser protective glasses.
| Class | Definition | Suggestion |
| 1 | Non-hazardous | No need for laser protective glasses |
| 1M | Visible laser for glasses safety (400-700nm) without optical magnification | No need for laser protective glasses |
| 2 | Glasses-safe visible laser (400-700nm), safe blinking within 0.25 seconds | No need for laser protective glasses |
| 2M | Visible laser for glasses safety (400-700nm), safe blinking within 0.25 seconds, with optical magnification | It is recommended to use laser protective glasses |
| 3R | It may be unsafe to look directly at the laser. The maximum allowable exposure (MPE) is 5 times that of Class 2 lasers in the visible part and 5 times that of Class 1 lasers in the invisible light part. | It is recommended to use laser protective glasses |
| 3B | It is not safe to look directly at the laser, avoid diffuse reflection laser as much as possible | It is recommended to use laser protective glasses |
| 4 | It is not safe to look directly at the laser and its diffuse reflection laser | Laser protective glasses must be used |
There are many types of laser protective glasses, with different materials, different principles, and different applications. Therefore, in order to provide effective protection to the laser, a reasonable choice of laser protective glasses must be made according to the specific use requirements. When choosing a protective goggles, first determine the maximum irradiance or maximum irradiance of the laser output according to the maximum output power (or energy) of the laser used, beam diameter, pulse time and other parameters. Then, determine the minimum optical density value required by the glasses according to the maximum allowable exposure (eye exposure limit) of the corresponding wavelength and exposure time, and select the appropriate protective glasses accordingly.
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