Can't see while welding

I really think welding is fun. However, I can't do it very good because I have trouble seeing the weld itself, I am kind of poking around in the dark. I am fifty years old and use my reading glasses while welding.

I have a Miller Mig welder and use a standard welding helmet because I seem to see better with that than an auto darkening helmet.

What darkness of lens do you guys use when Mig welding?

Thanks,
Rod