For things that I use every day, I prefer to pay a bit more if the quality is stable. It makes it easier to compare with an old pair of glasses that already fits well. I also check if the lenses have any blue light filter or anti-reflection coating. Whenever I find something that actually works well, I tend to reorder it later.

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:

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Clear product descriptions save time and reduce the chance of disappointment. Whenever I find something that actually works well, I tend to reorder it later. If a deal looks too good to be true, it usually has some kind of catch. If the first order is a disaster, I prefer to move on and not waste time with support. Even a short note like 鈥渢his size runs smaller than expected鈥?can help someone. Now I try to read as many real user reviews as possible before I buy anything. I do not trust only the star rating, I like to see detailed photos and longer comments. On the other hand, a well made pair of glasses can last a long time and feel comfortable all day.

Just sharing my personal feedback.