Hollis's own brand Negative Diopter lenses, for the left side of the M3 Dive mask. To correct a diver's vision, in the same way, that glasses would. Diopters range from -1.5 through to -8.0
Hollis's own brand Negative Diopter lenses, for the left side of the M3 Dive mask. To correct a diver's vision, in the same way, that glasses would. Diopters range from -1.5 through to -8.0