Comments:
To my knowledge the only glass case that opens at the top rather than on the side, which enables you to retrieve your glasses with one hand, e.g. from the cockpit side pocket or from a flight bag. Unfortunately, the "belt clip" is useless as such as you will lose your glasses sooner or later (I did !@#$+#@!!). Therefore only ****. Still, a clever product at a reasonable price, bearing the limitation in mind.