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Laser protective eyewear (LPE) is not one-size-fits all. It is also not one pair protects all. Appropriate LPE is an important component of every laser safety program. LPE is designed to attenuate laser radiation to levels below the harmful threshold, known as the Maximum Permissible Exposure (MPE). Unlike other types of radiation (think ionizing radiation, like X-rays) where most day-to-day uses of that type only produce biological effects after cumulative exposures, serious laser injury from common applications can occur from a one-time acute injury. Effects like burns or eye injury. Those to the eye can be temporary or permanent, partial or full. Therefore, it is critical that users of lasers understand how to properly identify the appropriate LPE for their application. Let’s consider some critical elements of LPE knowledge and selection.

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While this may seem like an obvious point, there are numerous examples of laser eyewear being used for a procedure or application that provide no actual protection to the user. The user of the laser must always verify that the pair of LPE they put on protects against the wavelength being transmitted. While LPE can be designed to protect against multiple wavelength ranges, no one pair will offer protection from all.

A plane electromagnetic wave is said to be linearly polarized. The transverse electric field wave is accompanied by a magnetic field wave as illustrated.

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LPE should fit properly and be comfortable or they likely will not be worn at all times as is required. Eyewear comes in all different frame styles, including over-the-glasses and with prescription lenses. Work with your LSO to find the right pair for you.

LPE is meant to filter light and protect the eye. In doing so, the ability to see ambient light can also be affected. The user must be able to see through the eyewear with enough clarity to perform associated tasks. If the eyewear blocks too much ambient light, that can present a secondary hazard in the work area. VLT is a measure of how well one can see the ambient light and it is recommended that eyewear with a VLT below 20% be avoided. The LSO should be consulted for any LPE that has a VLT lower than 20%.

Knowing how to choose proper LPE is a critical task for laser users. This should be taught in the initial laser safety training and reinforced through consultations with the LSO.

The wavelength range, OD, and VLT values must all be physically inscribed into the frame or lens of the LPE. A label or ink that can be removed is not appropriate. Users must be able to quickly and easily identify whether the LPE is protective for their application. The LPE must be in good condition and show no signs of damage. LPE should be inspected periodically and insufficient or damaged LPE removed from use.

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Engineering and administrative/procedural controls must be in place to mitigate the chances of a personnel exposure to laser radiation. These controls include barriers around the laser setup, entryway barriers, window covers, proper beam termination, effective alignment processes and detailed procedures. A well-designed laser setup should eliminate or reduce the number of stray beams that could cause injury and should remove objects that could cause a direct or diffuse reflection of the beam.

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Optical Density (OD) is the level of attenuation provided by the LPE filter material. LPE must have an appropriate OD value to reduce the laser radiation transmission through the eyewear to less than MPE levels. An example you might see on a pair of eyewear is OD 4 @ 190-532 nm. The Laser Safety Officer (LSO) must be consulted to ensure the necessary OD is known for each application.