I currently wear a prescription mask that has a clear area in the bottom of the lens to aid in reading gauges, etc. Do these lens cover the full inner area of the mask or can they leave the bottom area open. The other question would be on returns on a custom item like this. Thanks!
Bob (Certified Scuba Instructor at Scuba.com)
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Alpha 4 - MS11
4 window mask for medium to large faces Available with optical lenses from -1.5 to -8.0, bifocal lenses from +1.0 to +4.0. All lenses available in increments of .5 only Also available with a purge
Colors: Blue (B), Yellow (Y), Black/Clear (K), Clear (C)