Mask — What It Is and Why It Matters

A dive mask is a sealed lens and skirt assembly that creates an air pocket in front of the eyes, allowing underwater vision. Unlike swim goggles, dive masks enclose the nose so the diver can equalize the air space inside the mask as pressure increases with depth. A good mask seal is the single most important factor in comfort during a dive.

Masks come in single-lens, dual-lens, and panoramic designs. Low-volume masks (less internal airspace) are preferred by freedivers and photographers because they require less air to equalize and reduce refraction. Prescription lenses or bonded corrective inserts are available for divers who need vision correction.