The Traditional Lens (Grey) These lenses allow in 87% of visible light. Gray lenses transmit light evenly allowing the wearer to see colors as they naturally occur. All of our Polaroid lenses are made of optical grade plastic polarized lenses with a 7 layer back side anti reflective coating to reduce back side glare. All Polaroid sunglasses block 100% of harmful ultraviolet light. The Brown Lens (Including the above features) These Brown Polarized lenses allow in 78% of visible light. The Brown Lens is designed to block a high percentage of blue light. Blue light is at the dark end of the visible light spectrum and is the most difficult light to focus, especially as the eye ages. These lenses improve contrast by accentuating the brighter colors. Lens Materials & Optics - All of our Polaroid lenses are made of optical grade plastic polarized lenses with a 7 layer back side anti reflective coating to reduce back side glare. 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. ThatÆs 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. Gay lenses are the most color-neutral. They transmit colors evenly and are comfortable in bright, medium and intermittent light. Brown lenses are becoming increasingly popular, especially among women. Brown lenses enhance color contrast and preserve depth perception for activities such as driving, fishing, winter sports and golf. Mirror coated lenses offer increased light absorption in the bright sun, as will as fashion forward appearance. SAFER DRIVING VISION Polarized plastic lenses eliminate direct and reflective glare and can withstand the impact of deployed airbag.