I have a few thoughts on the "Icers" that Bernadette posted the link to. I have used both the kind Bernadette linked to and the ones Alo12 mentioned, which use the same basic idea. I used them for hiking in the winter and found they work really well to prevent slipping and falling. But as mentioned, they can sometimes be difficult to put on your shoes or boots. Especially when the rubber gets cold and it loses its flexibility. I could see that it would be an issue for someone without fully functioning hands. But it also reminded me of yet another version of this product I have used before, which might be more helpful for some people here.
http://www.leevalley.com/gifts/page.aspx?c=1&p=40911&cat=4,104,53221&ap=4
These have the advantage of being strapped to a shoe or boot with velcro, so they are much easier to put on or take off. Also because the spikes go around the outside of the sole, they offer considerably more grip and traction. The only drawback is they are about double the price.
One unfortunate drawback of all these items though, is that while they work really great on snow or ice, they might actually make walking on bare patches of roads or sidewalks or inside a store more difficult and uncomfortable. This would be a less of a problem with the ones that use coils on the sole, rather than spikes or cleats. Such as these:
http://www.yaktrax.com/ProductsWalker.aspx
The only problem with these ones are I found if too much snow got in the coils, they became virtually useless. I always preferred the ones with cleats.
"Don't be silly, Toto. Scarecrows don't talk. "