Oakley Latch (Model OO9265) PRIZM Polarised Replacement Lenses Snorkelling Mask watertight fit is achieved via

watertight fit is achieved via a dive-quality hypoallergenic skirt that securely adapts to a wide range of face shapes and as they stay on the face by gasket suction and stay firmly in place less adjustment is necessary

They work by filtering out horizontal light waves

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Apollo Scuba Dive Mask

The Accuri 2 Jr

Oakley Latch (Model OO9265) PRIZM Polarised Replacement Lenses Snorkelling Mask watertight fit is achieved viaPrizm Lenses Oakleys patented High Definition Optics (HDO) eliminates distortion to give you clearer, sharper, and more accurate vision. Customize the look of your LATCH eyewear and get the best optical performance for where you use it most. All replacement lenses feature the unbeatable clarity, impact resistance and 100% UV filtering of Oakley's High Definition Optics (HDO). Important Note: Use care when installing removing accessory lenses.