Proprietary Visionaries polarized lenses that meet and exceed all international standards for Optics, UV, Polarizing efficiency. WHAT ARE POLARIZED LENSES? Glare is everywhere and is due to the reflection of light on smooth surfaces. It gets worse when the surface is shiny. That's the case with water, snow and even certain roads or buildings. When driving, glare can be dangerous, blurring your perception and causing visual discomfort and eye fatigue. These polarized lenses eliminate 99% of horizontal glare and block 100% of harmful UV rays. WHY ARE POLARIZED LENSES A BETTER CHOICE THAN STANDARD TINTED LENSES? Tinted sunlenses reduce the amount of light and darken your vision, but do not address the glare problem and don't necessarily block 100% UVA and UVB radiation. These polarized lenses allow optimum light levels in for maximum comfort, clarity and more accurate color perception. They also eliminate headaches and fatigue caused by eyestrain. Gray lenses are the most color-neutral. They transmit colors evenly and are comfortable in bright, medium and intermittent light. Brown lenses enhance color contrast and preserve depth perception for activities such as driving, fishing, winter sports and golf.