It's been almost a couple of years since I decided to ditch contacts and start wearing glasses again, after 20 years. And on the whole I've been liking it. But one thing I just can't get past is playing the guitar in them. 
 
If I'm doing something really intricate or which involves a lot of position shifts, I like to look down at the fretboard for guidance. Funny, I never have to do that when I'm playing classical with the music in front of me, but when I'm just jamming away on my own I have to do the glance-down. But when you glance down at a fretboard with glasses on, the guitar neck is below the lenses so it's all a blur. I have to bend my neck right down to see my fingers with the lenses. And this causes neck strain. 
 
What I need is some kind of "guitar goggles" which extend all the way down to my cheeks. 

guitar goggles" which extend all the way down to my cheeks
 
I highly recommend those!
 
Before I went through the hyperbaric chamber treatments everything on my neck was a blur. I could see find far away. Afterward and ever since the neck is crystal clear but I dare not drive without my glasses

Perhaps it's time to consider dual range optical enhancement devices?
Once I came to terms with the idea, I rather like them.

The only glasses I use when playing guitar have an adult beverage in them. 

Something like Dennis Taylor's specs, but the other way up?
 

RobertB

Perhaps it's time to consider dual range optical enhancement devices?
Once I came to terms with the idea, I rather like them.

I would not recommend any form of multi-vision glasses when playing any instrument all sorts of strange things happen at the interfaces between strengths.  I found my keyboard became a W shape, the neck of my guitars seems to bend and as for the headache when looking down at the keyboard/guitar then backup at the computer screens. 

No lines bi-focals have gotten really good now. I have had them for the last 10 years and this last pear is fantastic, best ever. You have to have some height in the lens for them to work properly, or the sweet spot is to narrow and they transition to quickly, which causes the dizziness and headaches.

I went plastic frame, with a Clapton look on this pair and I love them.

huh... I started wearing glasses a few years ago and they easily cover the field of vision the fretboard is in.
 
Try wearing your glasses a little further down the bridge of your nose (which is why I avoided those wrap around arms that basically clamp the frames around your ears).
 
I also play with a strap when sitting which brings the guitar up to more of a classical playing position so maybe that has something to do with it. It's way easier to play that way though and not nearly as hard on my back, shoulders and neck.
 
IF I wore my glasses (which aren't huge lenses... quite "short" actually) pressed right up against my forehead AND had my guitar just sitting on my right leg I could see maybe having to crane my neck a bit. Honestly I can't even play properly that way anymore and it seriously does f*ck my back right up to the point of having to stop after a short period and likely spend a few days walking weird or stuck in the wheelchair.
 
I hate being stuck in the wheelchair.

Here you go
 

Looks like something Madonna would wear as a bra.