Laser Safety Glasses White Spectacle Frame with Dielectric Coated Glass Lens Clear 62% VLT. 301 laser filter was primarily developed for protection from laser wavelengths 690-10600 nm. Optical Density (OD) Specifications: OD 7+ @ 690-760 nm OD 4+ @ 760-950 nm OD 5+ @ 950-1000 nm OD 7+ @ 1000-1600 nm OD 5+ @ 1600-2400 nm OD 4+ @ 2400-2900 nm OD 5+ @ 2900-10600 nm Visible Light Transmission (VLT): 62%