We have experience in OEM production for 42 Years, provide OEM processing services for some WORLD BRANDS . All the eye glasses we made have undergone stringent tests, the material of lens are used in optics glasses , aerospace and other fields. The most common questions: Q1: I can't tell if the glasses work or not, except by making everything yellow tint. Do they actually reduce glaresQ2: It seems the glasses not very effective in reducing night time driving glare. No noticeable difference. A: 1. You will find someone around you, is probably feeling photophobic more than you would. They belong to the crowds who has high sensitivity to light. If you bought our night time glasses and found them not very effective, Please WRITE to us We would SOLVE this for you.2. Some users won't notice an immediate difference, because the human eye has a special mechanism which adjusts the eye's iris when exposed to different levels of light. The lens has cut lots of lights has longer wavelengths, which can't see by humans. In fact, wearing our night visor glasses will actually reduce the strain on your eye in the same light environment.3. We have tested a lot of different lens on the market, if this glasses won't work, most of yellow night driving glasses also won't work on you. You can test it and compared our glasses to others. We stand by the quality of our product. 4. All above may not represent that our glasses can cut all the high beam lights and glare, at present, no night vision glasses can mark this, except for a board. What we can provide is to cut part of glare and full beam headlights. Anyway, we are RESPONSIBLE for our product and customers.