These designer prescription glasses are made to accommodate most prescription lenses.TITANflex M899 frames feature a fashionable semi-rimless frame design, with a rim at the top and no rim underneath the lens. This design serves to reveal more of the face, and provides for a lighter frame weight. TITANflex Glasses TITANflex glasses are made by Eschenbach Optik, a market leader in German eyewear, and founded in 1913. Eschenbach Optik invented TITANflex® glasses in 1988 – and has since reinforced the unique combination of perfect wearing comfort and absolute design freedom. The TITANflex® brand is synonymous with superior memory metal technology and high quality materials. All glasses are super flexible at the bridge and temple, ultra-lightweight and less breakable than traditional frames.