Device i.e. monocular device, for avoiding condensation of mist on inner face of underwater diving masks, has transparent screens in form of flattened bulb, where screen incorporates air space between internal and external faces of screens

摘要

The device has transparent screens (1) in form of flattened bulb, where the screen incorporates air space (2) between an internal face (1b) and an external face (1a) of the screens. The air space is used as a heat insulator. The air space prevents humid and hot air obtained from breathing of a diver from being condensed on an internal wall of glasses or a mask.