Diseases

Anisocoria

Unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease. Pathologic anisocoria reflects an abnormality in the musculature of the iris (IRIS DISEASES) or in the parasympathetic or sympathetic pathways that innervate the pupil. Physiologic anisocoria refers to an asymmetry of pupil diameter, usually less than 2mm, that is not associated with disease.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease. Pathologic anisocoria reflects an abnormality in the musculature of the iris (IRIS DISEASES) or in the parasympathetic or sympathetic pathways that innervate the pupil. Physiologic anisocoria refers to an asymmetry of pupil diameter, usually less than 2mm, that is not associated with disease.

MeSH Record

Classification

Broader headings

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MeSH Record

Synonyms

5 entry terms
  • Pupil Diameter Unequal
  • Pupillary Size Inequality
  • Inequality, Pupillary Size
  • Anisocoria, Physiologic
  • Physiologic Anisocoria

MeSH Record

Aspects Covered

35 allowable subheadings

Indexed with the subheadings blood, cerebrospinal fluid, chemically induced, classification, complications, congenital, diagnosis, diagnostic imaging, diet therapy, drug therapy, economics, embryology, enzymology, epidemiology, ethnology, etiology, genetics, history, immunology, metabolism, microbiology, mortality, nursing, parasitology, pathology, physiopathology, prevention & control, psychology, radiotherapy, rehabilitation, surgery, therapy, urine, veterinary, virology.

MeSH Record

Indexing Annotation

consider also PUPIL DISORDERS or MIOSIS

MeSH Record

History Note

90

MeSH Record

Previous Indexing

  • Iris Diseases (1983-1989)
  • Pupil (1966-1989)

MeSH Hierarchy

Tree Numbers

AMA Style

References

  1. National Library of Medicine. Anisocoria. Medical Subject Headings (MeSH). 2026. Unique ID D015875. http://id.nlm.nih.gov/mesh/2026/D015875
  2. Anisocoria. In: Wikipedia. https://en.wikipedia.org/wiki/Anisocoria
  3. Anisocoria. In: Wikidata. https://www.wikidata.org/wiki/Q521953