Hello from another quilter with vision issues. I have keratoconus and severe astigmatisms, along with a large blind spot just off the center of my right eye. I have just about zero depth perception and for the mean-spirited, it probably can be quite funny watching me try to thread a needle. Fortunately for me although I wake up every day still legally blind, my contacts give me very good vision up to 3 feet away, my glasses take over after about 6-10 feet. Still no real depth perception but you learn how to read visual clues.
With my friend's long arm that I used for several years, I got one of the needle threaders shaped like a little bird. The "beak" closes over the hook and you hold it by the body. I knew which way the hole was (from the front) and I would pinch my left hand fingers around the needle and guide in the bird with my right.
Here's a you-tube, they are just on the notion wall area in general Fabric stores, I got mine at Joann.
https://www.youtube.com/watch?v=-SlDyAN4VGY