Materials     • CR39 Plastic lenses – Basic lenses with excellent acuity.     • Polycarbonate lenses – For a slightly heavier prescription, this is a thinner and lighter option. It is also impact resistant making it great for sports for safety reason. It is also the required lens for children and young adults under 18.     • 1.67 High Index lenses – For heavy prescriptions, this lens will be much thinner and lighter.     • 1.74 High Index lenses -  The thinnest and lightest lens on the market.Anti-Reflective Coating (AR) – AR coating prevents glare and increases the acuity of the lens. Ours is so advanced, it has a 2-year warranty against surface defects and minor scratches.Blue Blocking – Blue light filtering lenses protect your eyes from the damaging HEV light emitted from your iPhones, iPads, PDAs, and computer screens.Transitions – These lenses react to UV by getting darker, which means you cano enjoy the convenience of going in and out without having to alternate between eyeglasses and sunglasses – the lenses will adjust by getting clearer and darker on their own.Polarized lenses – the sunglass lenses cut glare by blocking reflecting light bouncing off of surfaces; a great choice for optimized sunglass performance.Progressive and multifocal lenses – These lenses have multiple prescriptions built into the lens so you can see your distance, reading and everything in between.Our opticians are always available and happy to make recommendations for your lens selection. We also always review submitted orders and will contact you if we have any recommendations for changes based on your prescription, measurements or frame choice.