Impact Overlay Mod.
Ever played a first/third person shooter? In the majority of shooters, you may realise as you take damage your display will redden, till you cure up! This mod adds this feature to Minecraft! The borders of the display will also change colour when hit with any of the negative potion effects, ones you cannot get a potion for currently (consume some rotten flesh!) , with the exception of nausea and Blindness, since, you understand, they mess up your screen .