CR-39, is a durable, lightweight plastic first used in bomber planes in World War II and now used for a wide variety of prescription glasses and sunglasses. Lightweight but with excellent clarity, CR-39 can withstand minor chemical splashes and welding sparks, making it the perfect material for safety lenses. Though CR-39 is durable and more scratch-resistant than other plastic eyeglass lens materials, it still requires proper care to maintain a long, crystal clear life. Learn clean CR lenses and keep them like new.
Instructions
1. Rinse lenses and frames with cold water. Gently rub lenses with the pads of your fingers (not your nails) to remove any debris.
2. Wipe frames and lenses dry with a soft, fluffy towel. Just remove the excess water from lenses; don't worry about streaks.
3. Spray CR-39 lenses on both sides with lens cleaner. If you have a non-reflective or other coating on your lenses, be sure you're using a lens cleaner safe for those surfaces.
4. Wipe dry with a soft 100% cotton or silk cloth, using a gentle circular motion.
5. Keep a silk square or pre-moistened lens cleaning tissues in your pocket or purse. These gentle cleaners work to clear your CR-39 lenses when you're away from home, and are a classier option than using the end of your shirt. Blow a few short puffs of air on the lenses before cleaning, to remove any particles of dirt or make-up that might scratch the lens as you wipe.
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