Monthly contact lenses toric lenses series bausch lomb purevision quantity 6 pieces type of lens soft lenses manufacturer specific features bausch lomb aergel technology material balafilcon a diopters 475 wearing time 1 month diameter 14 mm base curve 87 mgliche zylinder 0 75 1 25 1 75 2 25 mgliche achsen 10 180 oxygen permeability dk 110 water content 36 geeignet fr astigmatism dry eyes