The difference between ice and heat.

Ice eyes and hot compress eyes are used in different diseases, such as ice eyes, then normal is used for rapid swelling, but for infectious diseases is not ice. The principle of icing eyes is to reduce local temperature, vasoconstriction, reduce congestion, reduce leakage of liquid tissue in local blood, the most commonly used is eyelid edema caused by rubbing eyes, or eye congestion caused by allergies, which can be quickly eliminated by icing eyes. Edema, as well as reducing the symptoms of eye congestion and redness. The principle of hot compress on eyes is to dilate blood vessels by increasing local temperature, so that more white blood cells and antibodies can be transported through blood to reach local areas and strengthen anti-infection effect. Therefore, hot compress is needed when there are infectious lesions in local eyes. The most common is sty and conjunctivitis. Hot compress can be used to accelerate infection healing through towel.