Transition lenses. Magic lenses that turn dark in the sun.
We listed some vintage rimless and semi-rimless frames with Transition lenses.
If you want to customize your purchased frames from us, let us know and we will respond with an estimated cost and time.
The technology is called "photochromic lenses". History: In the 1960s Corning Incorporated became the first company to develop glass photochromic eyeglass lenses, which were successfully marketed under the PhotoGray brand. In 1973 researchers at PPG's Barbeton Technical Center began experimenting with applying photochromic technology to CR-39 monomer. The most popular lens manufacturer that makes them today is called "Transitions".