Canadian Medical Guide > Diseases > Nervous System Diseases > Neurologic Manifestations > Pupil Disorders Terms and Definitions

Pupil Disorders

Medical Definition:	Conditions which affect the structure or function of the pupil of the eye, including disorders of innervation to the pupillary constrictor or dilator muscles, and disorders of pupillary reflexes.
Guide Notes:	see also IRIS DISORDERS
Also Called:	Pupillary Functions, Abnormal,Pupillary Paralysis,Deformed Pupil,Efferent Pupillary Defect,Keyhole Pupil,Occluded Pupils,Pupil Reaction Absent,Wernicke Hemianopic Pupil,Pupillary Sphincter Rupture,Pupil Malformations,Non-Syphilitic Argyll-Robertson Pupil,Fixed Pupils,Ectopic Pupil,Afferent Pupillary Defect,Pupillary Sector Paralysis
Previously Indexed:	Pupil (1967-1989),specific eye disease (1969-1989)

Pupil Disorders Categories.

	Anisocoria - Unequal pupil size, which may represent a benign physiologic variant or a manifestion 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.
	Miosis - Pupillary constriction. This may result from congenital absence of the dilatator pupillary muscle, defective sympathetic innervation, or irritation of the CONJUNCTIVA or CORNEA.
	Tonic Pupil - A pupillary abnormality characterized by a poor pupillary light reaction, reduced accommodation, iris sector palsies, an enhanced pupillary response to near effort that results in a prolonged, "tonic" constriction, and slow pupillary redilation. This condition is associated with injury to the postganglionic parasympathetic innervation to the pupil. (From Miller et al., Clinical Neuro-Ophthalmology, 4th ed, pp492-500)

Pupil Disorders Medical Definitions and Terms

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