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 300x300px|Miosis caused by high doses of opiates.
After revision: Ehlers Danlos SyndromeCauses 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 300x300px|Miosis caused by high doses of opiates.