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What types of laser safety eyewear are available? Goggles: Goggles
* fit tightly on the face * typically worn over vision-correcting prescription eye glasses * usually constructed with frame vents to minimize lens fogging * larger, heavier than spectacles or wraps
* a frame that usually has two separate lenses with side shields * can be made with vision-correcting prescription eye glasses
* a frame with a single lens that covers both eyes * usually lighter than spectacles/goggles
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What are the technical considerations for eye safety?
There are two important concepts:
1. Maximum permissible exposure (MPE), is the level of laser radiation to which a person may be exposed without hazardous effects or biological changes in the eye. MPE levels are determined as a function of laser wavelength, exposure time and pulse repetition. The MPE is usually expressed either in terms of radiant exposure in J/cm2 or as irradiance in W/cm2 for a given wavelength and exposure duration.
* Exposure to laser energy above the MPE can result in tissue damage. * The ANSI 136.1 standard defines MPE levels for specific laser wavelengths and exposure durations. Generally, the longer the wavelength, the higher the MPE; the longer the exposure time, the lower the MPE.
2. The Nominal Hazard Zone (NHZ) is the physical space in which direct, reflected or scattered laser radiation exceeds the MPE. LSE must be worn within the NHZ.
* In practical terms, when using dermatologic lasers the entire laser procedure room should be considered to be within the NHZ because the laser fiber or handpiece can be directed anywhere in the room.