Powerview Mask from Tusa. A prescription mask that is slightly larger than most masks, being almost the size of the M-14 Visulator. This mask has a reverse teardrop shape to the lens, with an expanded bottom portion, giving you a greater downward view. It'sa great choice for divers with larger, rounder faces. The 5-position strap adjustor helps this mask to fit perfectly. Prescription lenses are available to purchase separately.