The G3390 is for Argon & Krypton Alignment laser wavelengths. LGF Full View frame with light blue-green color polycarbonate lenses. Glendale's polymer Diffused Viewing Only (DVO) designed eyewear maximizes visibility, with lightweight frame designs while providing unsurpassed attenuation for the entire range of laser wavelengths. 22 % VLT (visible light transmission). The LGF Full View frame features a one-piece polymer lens with integral molded side shields and adjustable earpieces. It fits over most prescription eyewear and meets ANSI Z136.1 and Z87.1 requirements.