Upside down goggles

Upside down goggles can be used to demonstrate human adaptation to inverted vision, and as a method of preventing motion sickness.

Stratton used a one-tube, monocular device because this also reverses left and right and he wished to set up an experiment without distortion of depth perception.

[5] In 1931 Theodor Erismann and Ivo Kohler conducted a series of experiments using mirror-prismatic upside down goggles employing only one mirror.

[6] After experimenting since 1984, in 1991 Hubert Dolezal procured a US patent for comfortable light weight upside down goggles.

[Patents of devices 2] Modern upside down goggles consist of two prisms fixed onto a comfortable ski mask-like base.