When to Contact a Medical ProfessionalĬontact a provider if you have persistent, unexplained, or sudden changes in pupil size. You should see a health care provider if you have sudden changes that result in unequal pupil size. Treatment depends on the cause of the unequal pupil size. Injury to the carotid or vertebral artery.Tumor, mass, or lymph node in the upper chest or lymph node causing pressure on a nerve may cause decreased sweating, a small pupil, or drooping eyelid all on the affected side (Horner syndrome).Seizure (pupil size difference may remain long after seizure is over).Infection of membranes around the brain ( meningitis or encephalitis).Increased intracranial pressure, because of brain swelling, intracranial hemorrhage, acute stroke, or intracranial tumor.Excess pressure in one eye caused by glaucoma.Brain tumor or abscess (such as, pontine lesions).Bleeding inside the skull caused by head injury.Other causes of unequal pupil sizes may include: Other medicines that get in the eyes, including medicine from asthma inhalers, can change pupil size. The use of eye drops is a common cause of a harmless change in pupil size. Unequal pupil sizes of more than 1 mm that develop later in life and do not return to equal size may be a sign of an eye, brain, blood vessel, or nerve disease. If there are no other symptoms and if the pupils return to normal, then it is nothing to worry about. If other family members also have similar pupils, then the pupil size difference could be genetic and is nothing to worry about.Īlso, for unknown reasons, pupils may temporarily differ in size. Most often, the diameter difference is less than 0.5 mm, but it can be up to 1 mm.īabies born with different sized pupils may not have any underlying disorder. Slight differences in pupil sizes are found in up to 1 in 5 healthy people. It gets larger in dim light and smaller in bright light. The pupil is the black part in the center of the eye. When you need to gain more weight during pregnancyĮnlargement of one pupil Pupils of different size Eyes/pupils different size DefinitionĪnisocoria is unequal pupil size.
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