What are UV ultraviolet light and VLT visual light transmission?

There are three categories of UV light: UVA, UVB, and UVC. The primary source of UV light is the sun. Other sources include welding arcs, video display terminals, fluorescent lighting, and mercury vapor lamps. UV light is harmful because it can be absorbed by the eye. In large doses or through repeated exposure, it can lead to cataracts or permanent eye damage. UV inhibitors are mixed into the polycarbonate material when the protective lenses are molded to screen 99.9% of all UV radiation, even in clear tints.

All lenses have a visual light transmission rating or VLT. Visual light transmission is the amount of visible light that can pass through a lens. For example, a lens with a VLT of 12% allows roughly 12% of light to penetrate the lens (and, therefore, blocks 88% of visible light).

Outdoor injuries from ultraviolet (UV) light can be prevented by wearing sunglasses that block ultraviolet (UV) rays and by wearing broad-brimmed hats. Be aware that the eye can be injured from sun glare while boating, Lens Materials sunbathing, or skiing. Use eye protection while you are under tanning lamps or using tanning booths. You should be on the lookout for lenses that absorb > 99.9% of UVA and UVB radiation up to 385nm. Some tinted styles protect up to > 400nm. And in case you were worried about solargenerated UVC, it is not a direct threat because the ozone layer absorbs virtually all of these rays. For a summary of what products cover which set of circumstances, visit the Uvex Lens technology page

Learn More:

The Guide to Eye and Face Protection
Like many others, you probably take your eyes for granted. But imagine what would happen if you suddenly lost your vision or had an accident where your eyesight became dramatically diminished. Some people would say that if they’re lucky, then they will never have to worry about it. Uvex thinks there’s more to it than just luck, that’s why we have written this guide  which will  answer many basic questions, as well as some you may have never even thought to ask.
Download the Guide to Eye and Face Protection
Lens Tint Reference Guide
Providing truly functional eyewear is becoming a much more specialized task, particularly as the specifics of various jobs are analyzed across many industries and market segments. Impact protection, while certainly a vital requirement, is no longer the sole function of protective eyewear. Fit, comfort, style and through the use of specialized lens tints all contribute to a total package that addresses workplace hazards as well as compliance issues faced by the safety  professional.
Download The Lens Tint Reference Guide

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