Any duplication or distribution of the information contained herein is strictly prohibited. ![]() No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. This inconsistency is further exacerbated by the fact that circadian effects can modulate the wavelength sensitivity. Links to other sites are provided for information only – they do not constitute endorsements of those other sites. Non-visual photoreceptors (ipRGCs) and rods both exert a strong influence on the human pupil, yet pupil models regularly use cone-derived sensitivity as their basis. A licensed medical professional 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. Prior eye trauma, including surgery for cataractsĪ.D.A.M., Inc.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).On the other hand, if the difference in pupil size is larger in bright light, then the larger. If the difference in size between the pupils is larger in the dark, then the smaller pupil may not be reacting well and could be the abnormal one. Infection of membranes around the brain ( meningitis or encephalitis) One of the most important parts of the exam for anisocoria is figuring out which pupil is not normal.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).Pupil size is essential in controlling incoming light and providing vision. Bleeding inside the skull caused by head injury Our study demonstrated that postoperative pupil size decreased under both scotopic and mesopic lighting conditions postoperatively however, these decreased values rebounded to their preoperative levels within one month postoperation.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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