I think this is one of the few real advantages we have compared to shopping blindly. Bad lenses can cause eye strain, reflections and headache when you wear them for hours. It makes it easier to compare with an old pair of glasses that already fits well. It is always difficult to know which website is really trustworthy before you place an order. I think sharing honest feedback helps other buyers avoid the same mistakes. 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:
[url=https://rentry.co/44321-my-journey-from-cheap-to-premium-prescription-glasses]
check this link
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Now I am more careful with impulse buys and limited time offers. I like when a shop clearly shows PD, lens height and bridge width in millimeters. In the past I have wasted money on items that looked good in photos but felt cheap in real life. Nose pads that are too hard leave marks and feel uncomfortable on the skin. Sometimes a store looks great in ads but the real product is completely different.

Hope this helps someone.