Eye

Description The center of a hurricane is known as the eye. It is a 20-65 km (12-40 mile) wide region of relatively clear and calm conditions brought about by descending air. Eye in IR Imagery In infrared satellite imagery, a region of relatively warm temperatures (-11.5°C in the image) is associated with the eye. In this region, the infrared sensor may perceive warm, low cloud tops or even the surface temperature if the eye is clear. Eye in VIS Imagery

As you can see on the visible imagery of two hurricanes, the eye of a hurricane can be more or less distinct. A more distinct eye (lower left) usually indicates a strong or strengthening system. A more diffuse, less differentiated eye (lower right) can indicate either a weakening system or one in its early development stage. An eye region can be partially obscured by high clouds, falsely showing an eye less distinct than it really is.