I purchased my ergoprism loupes Jan 2022. It is almost Sept 2022. I have gotten to wear them 30 days until the lense fell out on its own. They glued the lense back in and then they needed to be sent back in for adjustment. I have lost count of how many times I've had to send them in for adjustments. It takes them days to email you back then it's email tag for a couple days then they finally send you a shipping label. Takes about 3 weeks to get back if your lucky. Then chances are they won't be right and you have to send them back multiple times. I loved the loupes for the 30 days I got to wear them but the company needs to work on getting them right BEFORE sending them back. Do not buy them unless you have a back up pair and are willing to wait almost a year to get them right. I am currently waiting on a shipping label.