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Chickens can have strokes or seizures, heart conditions, viral or bacterial infections that can cause neurological damage and sometimes these can effect their eyes directly and make them go blind. Another possible cause is disease, such as Avian Pox or Ocular Mareks. Quarantine them in case it is a disease and make sure they eat and drink and is kept as stress free is as possible. I would also advice taking them to a vet that knows poultry and have them thoroughly examined. Good luck!