The main things I look at for glasses are frame weight, hinge quality and lens coating. Reading comments with real body photos is one of the best ways to check sizing. When I test a new shop I usually start with one or two items instead of a huge order. Recently I have been testing several online eyewear shops to compare frames and lenses. I like when they mention whether the fabric has stretch or not, that detail matters a lot.

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=159992]
check this link
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For things that I use every day, I prefer to pay a bit more if the quality is stable. I do not trust only the star rating, I like to see detailed photos and longer comments. I have learned to avoid items that look extremely different in every product photo. Now I am more careful with impulse buys and limited time offers. Over the last months I noticed that some of my favorite items are not the most expensive ones. When every picture has different colors or extreme filters, it is usually a bad sign.

Maybe this is useful for someone.