I have found some of the manufacturers, the eye is so small about all you could thread would be a 90 or 100 wt silk!
Roxanne #11 needles are great because while they are tiny as a size 11 needle the eye is the size of #10 and I have threaded them with 30 wt!
I have an Ott floor lamp with the attached magnifier, plus I wear 2.5X cheaters when handquilting. So between the two I can see to thread them. As Tartan said, it is easier when you have something dark in the background and really, really good light.