It may seem trivial, but the ability to clean eyeglasses quickly and easily is important.
I have found the Bausch & Lomb Sight Savers to be a good addition to my kits.
At 100 for about $5, it is easy to put them in a kit, car, office, etc, and they work very well.
One time use, quick and clean, a small pre-moistened tissue in a foil pack that can be used on glasses, cameras, binoculars and magnifiers.
Include them with your eyeglass repair kit.
FWIW.