Patients with NAION don't have enough blood flowing to their optic nerve. Anastassiya Bezhekeneva/Getty ImagesA new study suggests people on Ozempic or Wegovy may be more likely to suddenly go blind.The condition, called NAION, is still exceedingly rare. It's also painless and untreatable.Blood-sugar issues can affect our vision.Eye doctors in Boston have started to notice a small but worrisome uptick in cases of a rare type of sudden blindness among patients taking semaglutide.They're raising questions about whether taking Ozempic or Wegovy might be leading to more cases of nonarteritic anterior ischemic optic neuropathy, a rare condition where blood stops flowing to the optic nerve, disturbing the connection between the eye and the brain.