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Possible causes unequal pupil size12/24/2023 ![]() Acute iritis is characterized by:Ī smaller pupil in the affected eye (anisocoria) Iritis is a form of uveitis (an inflammatory disease of the eye). Examples of conditions that cause anisocoria include: Iritis Pathologic anisocoria is different pupil sizes due to an underlying condition or disease. SEE RELATED: Small pupils: What do they mean? Pathologic anisocoria Bottom: Anisocoria with one pupil smaller than normal. Middle: Anisocoria with one pupil bigger than normal. It may be intermittent or constant, and sometimes it goes away on its own. The exact cause of simple anisocoria is unknown. The presence of simple anisocoria does not appear to be influenced by sex, age or eye color. In simple anisocoria, the difference in pupil size is usually 1 millimeter (mm) or less, and both pupils react normally to light. It’s a benign (harmless) condition that affects approximately 20% of the population. Simple anisocoria - also called essential anisocoria or physiologic anisocoria - is the most common type of anisocoria. But if it occurs suddenly, this can be a sign of a serious medical condition and you should see an eye doctor immediately.Īnisocoria is pronounced “an-eye-so-CORE-ee-ah”. ![]() In most cases, anisocoria is mild, constant and no cause for concern. One pupil may be bigger than normal, or one pupil may be smaller than normal, resulting in unequal pupils. Duplication for commercial use must be authorized in writing by ADAM Health Solutions.Anisocoria is different pupil sizes in each eye. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. ![]() The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Injury to the carotid or vertebral arteryĪ.D.A.M., Inc.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.
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