... 1.56 Progressive Short CR39 1.56/1.499 Single Vision,1.70 aspheric lens, 1.70 Titan lens, CR39 Lenticular ... , 1.61 Hicyl lens Semi-finished photochromic lensSemi-finished Single Vision lensSemi-finished photochromic and progressive lensSemi-finished photochromic and round ... proof,anti-besmirch,easy to clean and offer the best vision.7,Outstanding durability,since the inert material has strong ability ...