Who was faster?
The history of polarized glasses begins in Europe in 1937 with the German inventor Erwin Käsemann, although Stefan Ludwig Malus had discovered polarized light 125 years earlier (1808). After numerous experiments, Erwin Käsemann succeeded in producing a polarizing filter. How did that go? Well, he tried it with light-absorbing dyes, which he stored in molecularly ordered colloid foils. By stretching the molecules, he made them lie parallel to each other. He glued the now polarizing film between two cover glasses. In the USA it was the physicist Edwin Herbert Land who, as early as 1933, produced polarization films from polyvinyl alcohol with diffused iodine. He was also the inventor of today’s Polaroid cameras.
Against glare – polarized (sunglasses) glasses: Protection for 86 years
