Monthly contact lenses toric lenses series alcon air optix quantity 6 pieces type of lens soft lenses material lotrafilcon b diopters 500 wearing time 1 month diameter 145 mm base curve 87 mgliche zylinder 0 75 1 25 1 75 2 25 mgliche achsen 10 180 oxygen permeability dkt 108 water content 33 geeignet fr astigmatism dry eyes