People who share height and weight information make it easier to choose the right size. The main things I look at for glasses are frame weight, hinge quality and lens coating. I try to look for real photos of the insoles and soles, not only the outside of the shoe. Bad lenses can cause eye strain, reflections and headache when you wear them for hours.

If anyone is interested in real user experiences, I sometimes write short notes about the shops I test.
You can find one of the pages here:
[url=https://amelia.airwaysaviation.com/blog/index.php?entryid=117795]
check this link
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From my experience, communication with the store can tell you a lot. Many people do not mind waiting if they understand what is going on. Nose pads that are too hard leave marks and feel uncomfortable on the skin. I think sharing honest feedback helps other buyers avoid the same mistakes. Sometimes I even measure an existing frame with a ruler before ordering anything new. If buyers say the item runs small or large, I always adjust my choice accordingly. Forums, blogs and communities create a kind of collective memory for shoppers.

Hope this helps someone.