Minus eleven is quite a strong prescription. No argument there. Yet somehow this Bettina pair does not give one the impression of strong glasses. The frame design plays a key role here, absorbing the lenses in a discrete way. Major German brands like Rodenstock, Metzler and Menrad were experts at this and it explains their popularity among many clients. There was rarely anything striking, let alone flashy, about their glasses and it is my belief that they deliberately left those aspects to other brands.