I have not much cornea, but some pressure points which I would like to remove this device through the daily wearing of safety shoes uncomfortable. Unfortunately, the device is not really strong enough, the cornea is actually smoothed away rather than more. Unfortunately, you already needed for a decent result to achieve but then a few minutes, so I can imagine that the batteries are empty in no time. I'm going to buy more now the somewhat stronger coarser roles so that you would have to reach your goal faster.