The commands in the Blur submenu in the Effect menu are raster-based and use the document’s raster effects settings whenever you apply the effect to a vector object.

Gaussian Blur

Quickly blurs a selection by an adjustable amount. This filter removes high-frequency detail and can produce a hazy effect.

Radial Blur

Simulates the soft blur created by a zooming or rotating camera. Choose Spin to blur along concentric circular lines, and then specify a degree of rotation; Zoom to blur along radial lines, as if zooming in or out of the image, and specify an amount from 1 to 100. Blur quality ranges from Draft for the fastest but grainy results to Good and Best for smoother results, which are indistinguishable except on a large selection. Specify the origin of the blur by dragging the pattern in the Blur Center box.