Alexander's law states that in individuals with nystagmus, the amplitude of the nystagmus increases when the eye moves in the direction of the fast phase (saccade).
It is manifested during spontaneous nystagmus in a patient with a vestibular lesion. The nystagmus becomes more intense when the patient looks in the quick-phase than in the slow-phase direction.

The law was named after Gustav Alexander

Gustav Alexander

Gustav Alexander was an Austrian otolaryngologist remembered for describing Alexander's law. He was the director of the Department of Otology of the Wiener Allgemeine Poliklinik from 1917 until his death...

who described it in 1912.