What must protective eyewear allow enough of to pass through?

Protective eyewear in tanning facilities is specifically designed to shield the eyes from harmful ultraviolet (UV) radiation while still permitting enough visible light to pass through. This is crucial because while the primary function of this eyewear is to protect users from potential eye damage caused by UV rays, it also needs to allow visibility so that users can comfortably and safely navigate their environment.

The importance of visible light is underscored in tanning settings, where patrons need to be aware of their surroundings to avoid accidents and ensure usability of the tanning equipment. If protective eyewear blocked too much visible light, it would hinder the user's sight and overall experience, potentially leading to unsafe situations.

Other forms of light, such as infrared and heat, are generally less relevant in the context of protective eyewear for tanning beds. The focus remains on balancing effective UV protection while ensuring enough visible light passes through for visibility and safety.