Serengeti Sassari Polarized Sunglasses for Men & Women - UV Protection, Lightweight Aviator Style - Perfect for Driving, Travel & Outdoor Activities

After 3 years of almost daily use they're still in excellent condition.The glass photochromatic lenses do not have a single scratch on them and darken and lighten as expected. In the past, I got the more common sunglasses with polycarbonate lenses and no matter what the brand and how careful I was with them, they'd end up getting scratched within a few days, and my vision would be hazy after a few weeks due to the myriad of scratches.The fit has not changed. Perhaps it's the frame quality and the spring loaded hinges. The arms are still symmetrical. When I open the arms and set the glasses on a flat surface, the arm tips are level. The fit on my ears and temples are even on both sides and when I tilt my head down, the glasses do not slide off. I mention these because any unevenness would bother me a great deal.I'm usually careful with my possessions but I did drop the glasses from atop my head down to a concrete floor a few days ago. Fortunately, no glass breakage or other damage, but the incident prompted me to write this review.I've worn the glasses for hours under an over-the-ear aviation headset and with the ear cups properly adjusted, it's a very comfortable combination. Of course, this all depends on one's head shape and size.Mine came with a hard clamshell-type case which I always use when transporting the glasses in backpack or briefcase. Transporting without a hard case will eventually result in damage.The only maintenance I perform is that I wash the glasses in soap and water every day or so. I use paper towels to dry them off. Paper doesn't scratch the lenses (unless it has "sand" as a prefix).When participating in activities requiring better eye impact protection, e.g., shooting sports, properly rated polycarbonate lenses are a better choice. However, for daily use, I prefer these.