mineral 1.523uv optical lens eyewear,rx lenses ) imported material . Longer time won't be yellow.2) Diameters: 50mm,55mm, 60mm, 65mm, 70mm,75mm3) Uncoated lens, hard coated and Multi-coating,HCT,Super hard4) progressive,flat top/round top bifocal, Tinted lens, polarize lens(gray and brown)5) semifinished lens is also available We are..