Designs for Vision... almost all the dentists I have observed in private practice use them, and they were originally designed for surgeons (intricate, life-saving surgeons...). I got my 2.5x, Titanium frames (very lightweight) for $850, and they even gave me a payment plan (3 payments of ~$250 each). My friends bought the 3.5x for $1025. They have a 45-day free trial (no obligation) and if you want to bump to a higher magnification, they will do it for only the cost of the difference in magnification! Also, the frames have a lifetime warranty. Even if you roll over them with your car, they will replace the frames because it will be considered a manufacturers' defect 🙂
I notice that a lot of people on clinic who have other loupes, or no loupes at all - (Orascoptic, Sheervision, Surgitel, and especially the flip-ups... this is just what I've noticed, I'm sorry if you're a dedicated user of those brands, no offense meant!) are all scrunched over on their patients, all up in their faces getting spit and blood all over them ... which is disgusting in and of itself 😱, but worse is that eventually their backs will need tweaking and practicing dentistry will be pretty tough for 'em!! The majority of the ones who wear DFV, though, have good posture (which, gasp, is the purpose of owning the stupid things lol).
And no... I don't get any compensation from the company, I just really love my loupes!! 🙄