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Ryders full focus lenses are shaped thicker through the middle where the eye looks through and thinner towards the outer edge. This allows the eye to focus forward resulting in no eye strain or fatigue. Ryders Eyewear Salty Dog Sunglasses: -Anti-Slip. -Duraflex. -Prismatically and optically correct. -Polycarbonate: impact resistant. -Hard coated: scratch-resistant coating applied to all lenses. -100% UV protection. -Mirror coating: reflects rays from surfaces such as water, snow, and ice and increases light filtration. -Performance Gradient: lower light transmission at the top of the lens to block light from above combined with a high light transmission at the bottom for better visibility of the terrain. -Anti-fog lens coating reduces fogging in moist and damp conditions providing crystal clear vision. -High pressure injection molded lenses register less than 1.6 on the Crystal Meter.