I use a makeup mirror/magnifier. You can get little ones for super cheap at a dollar store. Sometimes I just am tired and seem to get cross-eyed.LOL! JK. They really are nice. I keep in my tool cache.

The index card is a good thing. My technician puts his little finger behind the needle and I do now.

I would go have my eyes checked, because Im sorry to say it won't get any better.

Use a top stitch ( or whatever it is called). Needle which has a larger hole

An embroidery thread needle also has a larger eye and I find it much easier to thread Top stitch needles will also have a larger eye

This method also works for me. I do put my face down close to the needle when threading because I have double vision and need to be up close to actually see the hole in the needle. Even so, 'spit' method of threading the needle decreased the number of attempts at threading significantly!

That's what I do also, except I just wet the back of the needle eye. If I have a problem with that, I clip on magnifying glasses so that I can see better. The magnifying glasses really help. Also, I have an Ott light on each side of my machine. The extra light helps me. I, too, have a Bernina. My automatic needle threader isn't working now. That's something I'll get repaired when I take the machine in.

I have an old Nechhi needle threader. I know that JoAnn's and Nancy's notions carry something similar for threading machine needles. I used to use it all the time. Since the eye surgeries I don't use it anymore.

My machine has a needle threader but when I didn't have one I would put a white index card behind the needle to make the hole more visible. I also use a pair of reading glasses to thread my longarm