Years ago I used up some of my fleece scraps making these very quick eyeglass holders. We still have them and still use them all the time. I forget how many I made, but I made them in various sizes to hold different size glasses. Those wrap around type sunglasses really need a big case, but reading glasses only require a slim little case.
I also had some scraps of flannel so I cut some small squares of it with pinking shears, to keep it from fraying, and added an extra, shorter piece of fabric when I sewed the edges of the case together to make a pocket for the little flannel cleaning cloth.