The "wall of glass" can offer privacy but it has another advantage as well. Depending on the vantage point of the viewer, there are less power rings than what might be expected. This is demonstrated here, especially in the upper photo. High index lenses are popular as they reduce lens thickness but the additional cost is immense. Also, I sometimes get the impression that opticians occasionally put some pressure on clients to choose high index lenses for moderate prescriptions. There is no doubt that the option for high index lenses make sense when the prescription is minus twelve. On the other hand, there is no way of hiding such a strong prescription - the massive "cut in" effect and the mighty power rings clearly tell what's going on. So why not prefer "showing rather than hiding" and keep lots of money in one's pocket?
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