specific gravity:1.20, Abbe Value:30, Up to 40% thinner,33%lighter Available in PC HC/Tintable/ HMC+EMI 1,Refractive Index:1.592,Specific Gravity:1.203,Abbe Value:304,Up to 40% thinner,33%lighter5,Avaliable in-PC HC/Tintable/HMC+EMI PC single vision lenses