Typically, signs and symptoms of Horner syndrome include decreased pupil size, a drooping eyelid and decreased sweating on the affected side of the face. The abnormal pupil may fail to respond to light or have problems with sight. Mechanical anisocoria is unequal pupil sizes from damage to the iris or its supporting structures. It is caused by the disruption of a nerve pathway from the brain to the head and neck. Some of the most common causes include: Migraine headaches. The links above will provide you with more detailed information on these medical conditions to help you inform yourself about the causes and available treatments for these conditions. The unequal pupils mean that one pupil is bigger or smaller than the average size. Anisocoria can be caused by a lot of conditions in your body, injuries, traumas and even some medicines. 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. Understanding your symptoms and signs and educating yourself about health conditions are also a part of living your healthiest life. Cluster headaches can result in a constricted pupil. Concussion of the brain may cause unequal pupils if the injury affects certain areas of the brain. The risk of stroke can be reduced by controlling high blood pressure, high cholesterol, diabetes, and stopping smoking.Īt MedicineNet, we believe it is important to take charge of your health through measures such as a living healthy lifestyle, practicing preventative medicine, following a nutrition plan, and getting regular exercise. cases have no serious cause however, it is important not to miss rarer conditions such as neuroblastoma, which may present after a difference in pupil size. Head Trauma A concussion of head trauma can cause unequal pupils. Treatment may include administration of clot-busting drugs, supportive care, and in some instances, neurosurgery. Symptoms of a stroke may include weakness, numbness, double vision or vision loss, confusion, vertigo, difficulty speaking or understanding speech.Ī physical exam, imaging tests, neurological exam, and blood tests may be used to diagnose a stroke. If you are experiencing a reduced pupil size on one side of your face it might be an indication that you are suffering from Horner syndrome. Other medicines that get in the eyes, including medicine from asthma inhalers, can change pupil size.A stroke is an interruption of the blood supply to part of the brain caused by either a blood clot (ischemic) or bleeding (hemorrhagic). 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. In many people, the size of the pupils is the same in each eye, and both pupils will. Most black eyes are minor and heal on their own however, some may lead to significant injury. Corneal ulcer/injury A brain or neurological disorder affecting the specific nerves running to your dog's eye (i.e. The most common cause of a black eye is a trauma injury to the face or head. 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. Anisocoria is a term which refers to the pupils being different sizes. There are a variety of reasons your dog may have pupils that have different sizes. 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. Anisocoria Enlargement of one pupil Pupils of different size Eyes/pupils different sizeĪnisocoria is unequal pupil size.
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