[GilbertAmike]

It makes it easier to compare with an old pair of glasses that already fits well. Many people do not mind waiting if they understand what is going on. Price is important to me, but quality and comfort are even more important in the long run. If buyers say the item runs small or large, I always adjust my choice accordingly. I like when a shop clearly shows PD, lens height and bridge width in millimeters.

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:

click here
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Very thin fabric may be fine for summer but often looks cheap and becomes see through. Good stitching usually means the item will not fall apart after one or two washes. If a website gives a detailed guide for measurements, I feel more confident when ordering. They are simply the ones that fit well and survive many rounds of washing or daily use. Many people do not mind waiting if they understand what is going on.

Hope this helps someone.