The LV-F22.P4B05 is for Diode Alignment. F22 style glasses with blue color polycarbonate lenses. Laservision's Polycarbonate eyewear is designed to provide excellent field-of-vision lenses with multiple wavelength coverage. 42 % VLT (visible light transmission). F22 glasses are light weight providing comfort during long term use, and easily fit over prescription eyewear. Meets ANSI Z136.1 and EN207 requirements.