Yes, you do not want it in your eyes, it clots. No permanent damage, you just can't see for a while. You also do not use the clotting sponge by itself. You still need to put a pressure bandage over the top, it makes the pressure bandage much more successful. If you have bleeding that bad, seek professional medical attention as soon as possible, it is not a permanent solution. When you remove the clotting sponge it will likely begin to bleed again. We used them in conjunction with a tourniquet and a pressure bandage, it just increases the chances of success. In fact, the tourniquet is the first thing I am going to slap on if the bleeding is that bad, then the clotting sponge, and then cover it with a pressure bandage. It is not something I am going to use unless it is a life threatening or very dangerous situation. Find some of the new research on tourniquets, they are not a dangerous as used to be taught.