Before revision: Causes Age Senile miosis (a reduction in the size of a person's pupil in old age) Diseases Horner's syndrome Hemorrhage into pons (intracranial hemorrhage) Hereditary disorders Cluster Headaches with ptosis Iridocyclitis Fatal familial insomnia Aphakia Drugs Opioids such as fentanyl, morphine, heroin and methadone (the notable exception being pethidine) Products containing nicotine such as cigarettes, chewing tobacco or gum.
After revision: Causes Age Senile miosis (a reduction in the size of a person's pupil in old age) Diseases Horner's syndrome Hemorrhage into pons (intracranial hemorrhage) Hereditary disorders Cluster headaches with ptosis Iridocyclitis Fatal familial insomnia Aphakia Drugs Opioids such as fentanyl, morphine, heroin and methadone (the notable exception being pethidine) Products containing nicotine such as cigarettes, chewing tobacco or gum.