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ISO 7010 states on all symbols with a first aid cross, that it "may be replaced with another element appropriate to cultural requirements". In countries with a Muslim -majority population, an appropriate symbol is the crescent .
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The scale numbers range from LB1 to LB10, where the number is a lower limit for the optical density, i.e. LBn means that OD > n, or <, where T is the transmittance. The minimum scale number for a given laser with a beam diameter of 1 mm depends on the working mode and the wavelength as follows (EN 207:2017):
Adequate eye protection should always be required for everyone in the room if there is a significant risk for eye injury. High-intensity beams that can cause fire or skin damage (mainly from class 4 and ultraviolet lasers) and that are not frequently modified should be guided through opaque tubes.
Eye protection is protective gear for the eyes, and sometimes face, designed to reduce the risk of injury. Examples of risks requiring eye protection can include: impact from particles or debris , light or radiation , wind blast , heat , sea spray or impact from some type of ball or puck used in sports.
Blunt force trauma can occur to the eye when excessive force comes into contact with the eye. Chemical burns, biological agents, and thermal agents, from sources such as welding torches and UV light, also contribute to occupational eye injury. [14] While the required eye protection varies by occupation, the safety provided can be generalized.
The design process and testing of ISO 7001 symbols is governed by ISO 22727:2007, Graphical symbols — Creation and design of public information symbols — Requirements. [2] Common examples of public information symbols include those representing toilets, car parking, and information, and the International Symbol of Access .
P280: Wear protective gloves/protective clothing/eye protection/face protection. P281: Use personal protective equipment as required. P282: Wear cold insulating gloves and either face shield or eye protection. P283: Wear fire resistant or flame retardant clothing. P284: Wear respiratory protection.