When driving - the red lens neutralizes the green light. You can see red and yellow lights, but when green traffic light, you cannot see it through the red lens. I love Rainbow OPTX. I have all colors in different styles so they are fun and sporty, cool and a conversation piece! lol. A lot of pros! Only con is it took me 2 traffic lights to figure out you couldn't see a green light through the red lens so I just don't wear them when driving. I tested them all, it is the only color that neutralizes the green light so you cannot see it. I highly recommend their shades and styles. The service, the specials, the cards they include with positive affirmations and to let you know what mood each color promotes are really fun!