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1.56 Semi perfecta progressivum photo griseo optical lentium
Index refractivus lens est superior, tenuior lentium, major densitas, durities et melior, contra, index refractivus inferior, densior lens, densior minor, durities etiam inops, vitrum communis durities; Itaque index refractivus fere fere 1.7 est, et durities resinae pelliculae tenuior est, index refractivus relative humilis est, resinae frustum in mercatu nunc frequentissimus est index refractivus 1.499 vel ita, Paulo melius est versio ultra tenuis; which has a refractive index of around 1.56 and is also used the most.
