I recently purchased the Ergo Loupes. I sent them back because of the left ocular was misaligned. Also changed to a lower magnification thinking maybe that would help broaden the field of vision. I received them back very quickly but it was the same issue with the left eye being misaligned. I tried again adjusting the nose piece etc but to no avail. Also they’re a little heavier than other loupes I have had/used. The plus is that you can adjust your distance depending on how far the pt can or cannot recline. I did not like the fact that a expensive purchase can be delivered at your doorstep without a signature. If I would've known, then I wouldn’t send it to my residence. I would have sent them to my office.