The sound of pressing on the inner corner of the eye is a normal physiological phenomenon and is due to the air bubbles in the tear sac. Under normal circumstances, the tears in the eye are in constant flow, and the newly secreted tears flow over the surface of the eye and then flow from the inner corner of the eye into the tear sac and then into the nasal cavity, where they are absorbed by the nasal mucosa. When tears enter the lacrimal sac, they also bring in some air and form air bubbles in the internal sac. When pressure is applied to the inner corner of the eye, it squeezes the tear sac and causes the air bubbles to make a sound. Sometimes when there are fewer or no air bubbles in the tear sac, pressure will not make a sound. Whether or not the sound is made when pressing is not caused by disease, it is a normal physiological phenomenon and not something to worry about. However, if there is frequent tearing and discharge from the eye, it is likely that the tear sac is inflamed and should be seen by a doctor.