DIVING MASK FOR UNDERWATER AND AIR VISION

摘要

A diving mask (1) easily allowing both the underwater and air vision and containing, when in use, a suitable liquid to compensate the external pressure, comprises a first converging optical system (3A) to compensate the refractive effect of said suitable liquid inside said inner volume (9); and a second optical system (3B, 7), placed at said first optical system (3A), having a refractive index substantially corresponding to that of said liquid so as to be neutral when immersed, but having a diverging effect in air, so as to compensate in air the converging effect of said first converging optical system (3A).