What about if you already have/wear prescription glasses? Is the advice all the same? Or does that change things at all?
For the most part yes, but it can depend on the level of correction/prescription as to what type of frame works best (durability wise). Drill mounts tend to break easily with higher corrective prescriptions. They're also god awful delicate. Rimless frames suffer some of the same issues with chipping if the edges aren't beveled (and grooved) properly. Personally I like a lightweight metal frame because I still like to play mechanic from time to time.
I currently have prescription glasses with transition lenses. I like them, but since these are my first pair of glasses ever I didn't really know what I was doing and I got glasses with the frame and lenses too small. And since I'm wearing them all the time they give me a headache (so I end up not wearing them all the time if I can help it).
Transitions are a UV sensitive CR39 (plastic) lenses (that don't change well in the car because the factory windshields block UV. Photo-gray lenses are glass. So if you do have transitions, you shouldn't have a weight problem there.
Any issues with depth perception? The PD (Pupilary Distance) Optical center of the lenses has to match your eyes, or you will have a constant draw that causes eye strain. Or if you have a astigmatism and the lens is off axis, that will cause headaches also.
I think I'd prefer as light weight as possible, ultra padded/soft on the nose and ears. And really big lenses that cover as much of my field of vision as possible so I can see wherever I look without having to point my face directly at what I'm looking at to get it within the lens frame.
You don't want to go too big and end up with out-of-fashion BCGs (Birth Control Glasses...). Chances are, being your first pair you may have fiddled with them a bit to much from not being used to having them on your face (it happens). Or maybe they were just not fitted properly when you originally got them. Adjusting the frames to properly fit a persons face comfortably is an art.
I do understand what you mean about not wanting to have to turn your head all the time. I'm in my 2nd pair of progressives (no-line bifocals), and I absolutely hate them, because the corners blur due to the extra reading add power curves. But it kills my neck to have to keep wagging my head to look beside me.
While I don't know how small your small frames are, I do think if you went in and had them re-adjust the fit they'd annoy you a lot less. Nose pads should never be painful (even the cheap ones) if
Might not hurt to have the prescription verified also - Do make a point to mention the headaches. Eyeglass prescriptions are only good for 2 years.
Side Note: Renegades tip about the wrap-around style frames is a good one. We used to put perscription lenses in those frames for people all the time and never had any complaints. I was just never quite hip enough for Oakleys, and tended to go for the 70's style avaitor frames...Or something in a (non
-Harry Potter) medium round.