Redness of the eyes without significant other accompanying discomfort is known as simple conjunctival congestion. The cause is most likely physiological congestion, most often due to long-term bad eye habits, such as long-term use of cell phones and computers, long-term close office work, and poor eye habits that keep the muscles inside the eyes in a state of regulation and tension, and the continuous tension will make the oxygen consumption relatively increase. In order to compensate for the increase in muscle oxygen consumption, the eye will increase the local blood flow to ensure the supply of oxygen and energy, so there will be compensatory thickening and congestion of blood vessels. For this reason, the main way to relieve simple conjunctival congestion is to improve poor eye habits, so that the oxygen consumption and supply of the muscles in the eye can be restored to a healthy and balanced state, and the compensatory changes that produce congestion will be improved.