Well it's a pain in the neck - glasses falling off whilst wearing a welding helmet / putting the helmet on and forgetting the glasses etc but there is a simple cost effective solution
If you know what your glasses prescription is you can readily purchase magnifying lenses built to fit welding helmets - I had to trim mine to fit but so much worth the effort - I have x 2 magnification fitted to mine - all done for less than £9
Came from here but there are many other suppliers in the market
www.r-techwelding.co.uk/phantom-active-welding-mask-magnifying-lens/
If you know what your glasses prescription is you can readily purchase magnifying lenses built to fit welding helmets - I had to trim mine to fit but so much worth the effort - I have x 2 magnification fitted to mine - all done for less than £9
Came from here but there are many other suppliers in the market
www.r-techwelding.co.uk/phantom-active-welding-mask-magnifying-lens/