Spectacles / Glasses under Cycling Shades

[plastic_cyclist]

Does anyone else have this problem?
I have 2 pairs of Oakley Sutro's and now need glasses to read my Garmin....
Do I need to bite the bullet on the Sutro's and get some proper prescription shades?
I wondered if them inserts were any good? A few folk say they just don't work, so don't bother.

 

[Once a Wheeler]

Bi-focal sun glasses such as these work really well for me:

BBB BSG-76PH Comet Reader Photochromic Sport Glasses​

 

[oxoman]

The inserts aren't to bad, just about usable for reading a cafe stop menu but I wouldn't want to wear them for say a multi day trip or read a book. I've used them in Oakley knockoffs and also work respirator masks so you kind of get used to them. Personally I use some prescription optilab sport glasses or my normal glasses.