National Save Your Hearing Day is May 31 of every year. Did you know that about 10% of the population cannot hear? Celebrating this day, we are highlighting Hearing Aid Glasses which have been around since the late 19th century. The advent of the telephone changed everything with the transistor technology. Hearing Aid glasses were invented by Otarion Electronics with an electronic device that was put in the temple of eyeglasses. The Otarion Listener was the forefront and then closely followd by Beltone and Sonotone. It was estimated that by 1950 hearing aid glasses had a 50% market share.