Query About Ghosting/Shadowed Image.

Doctor, I'm Having Ghosting/Shadowed Image Due To Astigmatism. After Wearing Glasses, The Ghosting/Shadowed Image Reduced But Not Fully Gone. I Have No Keratoconus Or Other Eye Disease Or Glass Adjustment Problem. My Eye Doctor Told Me That The Remnant Ghosting/Shadowed Image Even After Wearing Glasses is Normal And Will Presist. I Also Found Some Of My Friend Who Have Only Astigmatism With Ghosting/Shadowed Image And They Also Have No Other Eye Diseases Or Glass Adjustment Problem But After That, Some Ghosting/Shadowed Image Remain Even After They Wear Glaases. Now, Why My Eye Doctor Saying That The Remnant Ghosting/Shadowed Image is Normal? Please Response, Doctor. I'm Begging Your Answer, Doctor.