Benign Anisocoria is related to Gender

Abstract

Benign or physiologic anisocoria (BA) refers to a small difference in the size of the two pupils, which is likely caused by asymmetry of sympathetic nervous system (SNS) innervation. Here I measure BA in a large sample of young adults and find that its distribution varies with gender. Females presented a small but significant bias to the right (right pupil larger than left), whereas males exhibited a larger and significant bias to the left (left pupil larger than the right).