This is a guest post by John.

The humble spectacle has been around for thousands of years in some form or other, since the ancient Chinese looked through thin, tinted pieces of grey quartz. Since then, glasses have really been left alone by the technology industry, which has touched almost every other market. The last major innovation in the field of glasses and sunglasses was way back in 1940, shortly after polarisation technology had been introduced. This came from Columbia Resins, a technology company experimenting with plastic compounds for different uses. They came up with CR-39, the 39th version of their polymer which was later adapted into millions of lenses, both tinted and vision correcting, and brought the price of glasses right down and to the masses. However, the advances in mobile wireless technology in the past few years combined with general advances in material and production technologies mean that lots of interesting glasses have been released in the past few years. Here are some of the most interesting: