... 499 Single Vision,1.70 aspheric lens, 1.70 Titan lens, CR39 Lenticular lens, 1.61 High-index lens, 1.61 Hicyl lensSemi-finished ... top bifocal/flat top bifocalMineral 1.523 Lens, CR39 sun lens, PC Polarized lens, 2, Safety: The lens adopt latest new material, high anti ... ,since the inert material has strong ability of corrosion resistance.8,supper anti-UV400 function can reduce the ultraviolet damage to ...