An eye is a characteristic feature of tropical cyclones, which are also known as hurricanes and typhoons in other parts of the world. Near the equator, warm ocean water can heat the air immediately above it, causing it to rise. As the warm, moist air rises, the air pressure below drops and surrounding cooler air rushes in. This air, in turn, heats up over the warm water and lifts as well. As the air rises, it cools, forming clouds and storms. Because of Earth’s rotation, the surrounding air rushes in with a swirling motion, causing the entire storm system to spin. As it rotates faster, some air at the top of the system sinks through the centre of the storm, forming a relatively calm, low-pressure area at the heart of the cyclone: this is the eye.
Answered by Tom Harris