Retinal detachment is actually considered and ocular emergency which requires surgery to be done within 24 hours if not permanent vision loss results, the eye cannot heal itself from retinal detachment even if surgery is performed later after the safe period elapses.
And to answer your question, yes please, diabetics also tend to suffer from slow healing when it comes to the eye too, even before complications set in that results in scar formation they tend to suffer from a myriad of ocular issues secondary to their underlying glaucoma condition including, diabetic cataracts formation, diabetic retinopathy, dot and blot hemorrhages, death of optic nerve cells, etc. Diabetes is just a very bad disease...