Great posts by all above.
When I was in dental school in the mid-1980s, none of the dental students wore loops. I know quite a few dentists who went to dental school since 2000, and they all wore loops in dental school. Once you wear them, you get used to them.
I have said on the forums that oral surgery is the easiest part of dentistry. This is true. The most difficult part is general dentistry, where you are looking at a half a millimeter all day long. For this you need loops (perhaps). For oral surgery, you do not.
I agree with the poster about the headlight. I did not train with these, but one of the practices in which I worked used only headlights. There were no overhead track lights. So, very quickly, I became accustomed to it, and now I use both.
The great thing about not wearing loops is that loops are so confining. I get to look around the room.
I do wear eyeglasses with gradual bifocals. I think my magnification in the lower part of the lens is +2.5.
The only time that I need the up close vision is when I seat an abutment on an implant-fixture. And at my age, all I need to do is take off my glasses.