Parameters

Control	Values	Applies to
Correction	Correct aberrations, or Deblur and recover detail	always
Amount	0.00 to 1.00	Deblur and recover detail only
Use GPU	on or off	always; off runs on the CPU, which is much slower

Correction and Amount apply to the whole image. There is no separate control for stars, because your optics blur stars and everything else in the same way.