I have purchased and they are still available at Keepsake Quilting (I believe) a magnifying glass that you may attach to your sewing machine above the needle. It is made so that it can be adjusted as to where you look through it.
I bought mine several years ago when I was SID (stitching in the ditch) for my grandson's quilt. My lighting was not that good and the magnifyer helped me very much.
There are also, on the market, stronger glasses that you could wear just to thread your needle. I know how frustrating that can be and in the past I have walked away from my machine because I could not get it threaded. (Days before I wore glasses.) Yolanda Wood River