Anisocoria

Definition

 * Unequal eye pupil size.
 * Affects 20% of the population
 * Can be entirely harmless or a symptom of more serious medical problems.


 * > 0.4 mm difference in diameter of one pupil compared to the other.
 * Benign as long as pupillary reactions are normal.
 * Anisocoria greater in bright light
 * Larger pupil cannot constrict
 * Blunt trauma
 * Open-angle glaucoma
 * Impaired parasympathetics to iris
 * CN III paralysis.
 * Anisocoria greater in dim light
 * Smaller pupil cannot dilate
 * Horner's Syndrome