• Our curve structure and lens design provides a clearer image than most flat lens designs. This glass lens performs extremely well in most conditions • This curve structure combined with the clear optical properties of glass, minimize reflection that often plague flatter designs while allowing a sharp view of the target • Zeiss® AR Coating that includes a Hydrophobic (water hating) coating, repels water completely and provides excellent scratch resistance while reducing glare • Target (1.355") - Designed for most 1-3/8" housings • 3D (1.75") - Designed for most 1-3/4" housings