Small, multi adjustable spectacles, reinforced , visible light transmission: approx. 70% ,color: light gray 850-900 DIRM LB3 LV CE (OD3+) >900-950 DIRM LB4 LV CE (OD4+) >950-<(><<)>980 DIRM LB5 LV CE (OD5+) 980-<(><<)>1030 D LB6 IR LB7 M LB7Y LV CE (OD7+) 1030-1400 D LB6 IR LB8 M LB8Y LV CE (OD8+) >1400-11500 DI LB4 R LB3Y LV CE (OD4+)