I had the same issue with the desktop magnifier - keeping the work in focus was tricky. Since I wear glasses, I chose to try Donegan’s Optisight instead of their Optivisor. Working quite well for me so far and fairly comfortable, although the band could fit better. Doesn’t come with a light, but my workbench light is sufficient. Only weighs 6.4 ounces. Comes with 3 different magnifications. Here’s an Amazon link:
Amazon.com: Donegan OSC OptiSIGHT Binocular Magnifying Visor, Black : Arts, Crafts & Sewing