Dice Goggles - Photochromic As you know, the lens color changes to black due to ultraviolet light. Clear lenses are used for night games, etc. The lenses change color to black during the day. Furthermore, the ultra lens makes it much easier to see bumps and irregularities! I used these at competitions. I used them separately, so the frequency of use was low, but there may be fine scratches and dirt that I didn't notice myself, so please refrain from purchasing if you are sensitive to such things. Please understand that the price reflects this. Thank you.