I usually buy safety glasses for both clear and tinted.
Got these today and very pleased ( broke my others - not as sturdily made.)
http://www.amazon.com/DPG59-220C-Reinforcer-Rx-Bifocal-Performance-Protective/dp/B000646VGM
same product in clear for rain and night
http://www.amazon.com/gp/product/B0..._m=ATVPDKIKX0DER&pf_rd_r=1E77YYN7J1XHXY69BFKK
Let's me read my iPhone for GPS and mail etc.
Because the frames flex a bit it's a bit harder to get them on with my AFX-55 with the chin piece - but easy on for the Bell Mag8 which is a looser fit.
I suspect with the Bell I could put the glasses on and then the helmet.
Price and build is great if it works for you.
Got these today and very pleased ( broke my others - not as sturdily made.)

Magnification diopter is molded into the polycarbonate lens.
Safety glass and Reading glass all-in-one
Impact resistant and 99.9% UV protection
Handgrip pattern on temple is ergonomically positioned for secure grip
Distortion free lens provides fatigue free use
http://www.amazon.com/DPG59-220C-Reinforcer-Rx-Bifocal-Performance-Protective/dp/B000646VGM
same product in clear for rain and night

http://www.amazon.com/gp/product/B0..._m=ATVPDKIKX0DER&pf_rd_r=1E77YYN7J1XHXY69BFKK
Let's me read my iPhone for GPS and mail etc.
Because the frames flex a bit it's a bit harder to get them on with my AFX-55 with the chin piece - but easy on for the Bell Mag8 which is a looser fit.
I suspect with the Bell I could put the glasses on and then the helmet.
Price and build is great if it works for you.