Chiropractic treatment and vision loss - In rare occurrences, forceful manipulation of the neck is linked to a damaging side effect: vision problems and bleeding inside the eye, finds the first published case report of chiropractic care leading to multiple preretinal hemorrhages.
Source: https://labblog.uofmhealth.org/body-work/examining-ties-between-chiropractic-treatment-and-vision-lossOmg, there is not even anything that connect the eye to the occipital lobe at the neck. So what, they expect to heal a retinal detachment by manipulating the patient's neck. Smh